Add the ability to use custom .table files.

i.e. You can overwrite our default translation strings for simple
commands such as \pi, or add your own custom commands such as \implies. 

This gives the advantage over the preprocessor of working better with
brltty and routing, as well as allowing us to change existing commands
and add new commands which may not be equivilant to any existing
commands. 
The preprocessor still serves an important purpose though, as I think it
works with more complex commands with arguments, where this will not.

latex-access.conf

@@ -1,6 +1,7 @@
 ;;; A sample configuration for the latex-access project
 ;;; http://latex-access.sourceforge.net/
 ;;; To use this config file under emacs move it to ~/.latex-access
+;;; To use it for BRLTTY move it to /etc/latex-access.conf
 ;;; To use it for both jaws and nvda move it to %appdata%/latex-access.conf. For instance,
 ;;; Type %appdata% into the run dialog, press enter, 
 ;;; And place this file in that directory.
@@ -35,6 +36,18 @@ capitalisation 6dot
 
 ;;; Path pointing to the preprocessor strings. 
 ;;; The preprocessor can be used to add custom commands to the translator which correspond to some standard LaTeX
-;;; Default location is ~/.latex-access-preprocessor.strings, but you'll probably want to change this for BRLTTY
+;;; Default location is ~/.latex-access-preprocessor.strings
 preprocessorfile ~/.latex-access-preprocessor.strings
+
+;;; Custom translation files 
+;;; These settings should point to a custom translations file to either add non-standard LaTeX commands or to overwrite existing translations. 
+;;; The format of the custom tables is the standard .table format. 
+;;; Custom Speech Translations 
+;;; Uncomment and change path accordingly 
+;speechfile ~/.latex-access/speech-custom.table 
+;;; Custom table for the nemeth Braille translations
+;nemethfile /etc/latex-access/nemeth-custom.table 
+;;; Custom file for the UEB translations
+;uebfile /etc/latex-access/ueb-custom.table
+
 ;;; End of Config

latex_access/settings.py

@@ -1,7 +1,7 @@
 # settings.py
 #    A part of the latex-access project at http://latex-access.sourceforge.net/
 #    Author: Daniel Dalton <[email protected]>
-#    Copyright (C) 2011,2012 Daniel Dalton/latex-access Contributors
+#    Copyright (C) 2011,2012,2013 Daniel Dalton/latex-access Contributors
 #
 #    This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation;
 #    either version 2 of the License, or (at your option) any later version.
@@ -18,7 +18,7 @@
 
 globals
 # Global settings for latex-access, these are the default values 
-settings ={"brailledollars":"True","speakdollars":"True","brailletable":"nemeth","capitalisation":"6dot","preprocessorfile":"~/.latex-access-preprocessor.strings"}
+settings={"brailledollars":"True","speakdollars":"True","brailletable":"nemeth","capitalisation":"6dot","preprocessorfile":"~/.latex-access-preprocessor.strings", "speechfile":"","nemethfile":"","uebfile":""}
 
 def loadSettings (file):
   """Read settings from file.
@@ -61,11 +61,24 @@ def activateSettings (instances):
   sessions to the values specified in the config file. Note the
   activation or deactivation of speech and Braille must be controlled by
   each module independently, i.e. not here."""
+
+  # points to our custom speech strings file 
+  speechfile =os.path.expanduser(settings["speechfile"])
+  # Decide what file holds Braille strings based on what table is in use.
+  if settings["brailletable"].lower() == "ueb":
+    bfile =os.path.expanduser(settings["uebfile"])
+  else:
+    bfile =os.path.expanduser(settings["nemethfile"])
+
   if 'speak' in instances.keys():
     instances["speak"].remove_dollars = not booleaniseSetting("speakdollars")
+    if os.path.exists(speechfile) and os.path.isfile (speechfile):
+        instances["speak"].load_file(speechfile)
   if 'braille' in instances.keys():
     instances["braille"].remove_dollars = not booleaniseSetting("brailledollars")
     instances["braille"].capitalisation=settings["capitalisation"]
+    if os.path.exists(bfile) and os.path.isfile (bfile):
+      instances["braille"].load_file(bfile)
   if 'preprocessor' in instances.keys () and os.path.exists(os.path.expanduser (settings["preprocessorfile"])):
     instances["preprocessor"].read(os.path.expanduser (settings["preprocessorfile"]))