PeopleSoft v1.3.0

Interim release as backup before practical exam dry run.

What's Changed

• Add Job related commands by @Spyobird in #81
• Update developer guide by @Spyobird in #84
• Updated DG by @thewrik in #85
• Update UG and DG after 2101 feedback by @ian-from-dover in #86
• Add input validation for the sign of rate parameters by @ovidharshini in #79
• Add info re: implementation of the serdes stuff by @zhongfu in #87
• JSON serdes improvements by @zhongfu in #88
• Person/Job ID improvements #1 by @zhongfu in #100
• Update DG by @ovidharshini in #90
• Add tutorial for writing serializers/deserializers for model classes by @zhongfu in #89
• Assign Rate attribute to Person by @Spyobird in #103
• Updated Employment to support many-to-many relationships by @Spyobird in #106
• Implement new UI by @ian-from-dover in #61
• Minor fix to app version and UG by @ian-from-dover in #118
• Enforce 8-space indented wrapped lines by @zhongfu in #101
• Implement payment class by @zhongfu in #116
• User guide changes: reflect Person add/edit changes + style by @zhongfu in #120
• Basic Export Functionality Added by @thewrik in #121
• Update Job related commands to use Index by @Spyobird in #109

Full Changelog: v1.2...v1.3.0