Broken revcheck links/diffs

[alfsb]

As reported on php/doc-base#298, normal sidebar links of web-doc/revcheck are generating arbitrary diffs. Also, as diff links gerenetaed by doc-base/revcheck are also generating unrelated diffs.

[alfsb]

I would also like to note, as www/revcheck may be changed, that

• doc-base/scripts/translation/genrevdb.php generates the table summary, that already has the labels of summary counts, so $TRANSLATION_STATUSES can be simplified or removed.

• There is a new field files.days that reports how many days the file is outdated. doc-base/revcheck shows this number as a column, and flags (background color orange) any files with days > 90.