v1.0.3

• Opens files as read-only when initializing NXFile instances, in order to prevent h5py exceptions when other applications, e.g., those not using the nexusformat file-locking mechanism, have already opened the file. If write mode is requested, it is applied when performing I/O operations.
• Calculates the size of NXfield arrays as 64-bit integers to prevent overflow issues when the NumPy prod function uses 32-bit integers. On some systems, this has caused large arrays to be loaded into memory inadvertently.