Mpxj

* Improve support for FastTrack files.

* Added flag to manage compliance with password protection. (Contributed by ztravis)
* Improve support for Synchro 6.1 SP files.
* Fix an issue where the task hierarchy was not correctly represented when reading a PMXML file.

* Add support for reading Sage 100 Contractor schedule grid files.
* Ensure attribute names are valid when exporting JSON.
* Improve handling of custom field lookup values (Based on a contribution by Nick Darlington).
* Fix an issue when copying a calendar which has exceptions defined.

* Add support for reading task early finish and late finish attributes from Asta PP files.
* Ensure XER files containing secondary constraints can be read correctly.
* Preserve calendar IDs when reading from XER files and P6 database (Based on a contribution by forenpm).
* Ensure base calendars are read correctly for P6 schedules.
* Ensure MPP files with unexpected auto filter definition data are handled gracefully.
* Preserve leveling delay format when reading tasks from MSPDI files.
* Ensure unexpected structure of timephased data is handled gracefully when reading MPP files.

* Add support for reading and writing secondary constraints from P6 schedules (Based on a contribution by Sruthi-Ganesh)
* Improve support for Synchro SP files containing blank tasks.
* Make constraint type mapping consistent when reading and writing PMXML files.
* Improve handling of leveling delay units and actual duration units (Based in a contribution by Daniel Schmidt).
* Improve handling of certain types of malformed MPP files.
* Improve handling of certain types of malformed SDEF files.
* Map P6 Equipment resource type to cost rather than work (Contributed by forenpm)
* Improve handling of certain MPP files containing large numbers of blank tasks.
* Improve handling of certain MPX files containing trailing delimiters.

* Set task start, finish and percent complete when reading SDEF files.