Added support for recently approved CPs.

Added support for CP-1287, CP-1294 and CP-1297 to the data dictionary.
Added support for Supplement 165 to data dictionary.

Added support for final text version of Supplement 165 (Breast Projection
X-Ray Image Storage SOP Class) to the data dictionary.
Added support for new UIDs from Supplement 165.

Added support for new SOP Class UIDs from Supplement 165 (Breast Projection
X-Ray Image Storage SOP Class).
Fixed wrong/missing comment on method parameter.

Fixed wrong comment on parameter "writeXfer" for the saveFile() method. In
case of EXS_Unknown not the currently selected transfer syntax is used but
the original one, i.e. the one in which the dataset was originally read or
created. Also added missing comment on parameter "oxfer" to write() methods.
Fixed various minor documentation issues.