Mpxj

* Add data date attribute to PMXML output.
* Update PMXML writer to avoid NPE.
* Update PMXML writer to allow task field used for Activity ID to be chosen.
* Updated to avoid NPE when reading an XER file where project not under EPS.
* Generate Task IDs if missing from MSPDI file

* Add support for PP files generated by Asta Powerproject from version 13.0.0.3 onwards
* Minor improvements to SDEF support.
* Updated to rtfparserkit 1.8.0
* Improve finish time handling in PMXML files (contributed by lobmeleon)

* Add support for resource assignment Stop and Resume attributes for MPP and MSPDI files
* Fixed [Issue 291](https://sourceforge.net/p/mpxj/bugs/291): PrimaveraPMFileWriter.write fails with java.lang.IllegalArgumentException
* Fixed [Issue 292](https://sourceforge.net/p/mpxj/bugs/292): Microsoft Project 2016 : Need to set 'Stop' and 'Resume' properties for net.sf.mpxj.ResourceAssignment

* Add support for PP files generated by Asta Powerproject up to version 13.0.0.3

* Add support for PP files generated by Asta Powerproject 11, Powerproject 12, Easyplan 2, Easyplan 3, Easyplan 4, Easyplan 5 and Easyplan 6
* Fixed [Issue 285](https://sourceforge.net/p/mpxj/bugs/285): Unsupported encoding command ansicpg949
* Fixed [Issue 288](https://sourceforge.net/p/mpxj/bugs/288): AvailabilityTable getEntryByDate does not work properly

* Fixed [Issue 285](https://sourceforge.net/p/mpxj/bugs/285): Unsupported encoding command ansicpg1254
* Fixed [Issue 286](https://sourceforge.net/p/mpxj/bugs/286): NullPointerException in CriteriaReader.getConstantValue
* Fixed [Issue 287](https://sourceforge.net/p/mpxj/bugs/287): Allow a character encoding to be specified when reading an XER file
* Write Primavera Primary Resource Unique ID to Task field Number1