Pygeometa

- MCF core: make identification topiccategory, fees, accessconstraints, maintenancefrequency optional (242)
- OARec: write keywords as theme/concepts if vocabulary exists (233)
- OARec: safeguard properties.rights
- WMO WCMP2: various fixes based on specification updates
- CLI: add -o as short option for --output
- ISO: distribution: ensure format_version exists or emit gco:nilReason=missing (240)

- OARec: bug fixes for keywords and null time intervals

- OARec: fix ref

- OARec: emit default keywords as bare keywords, not themes/concepts
- OARec: fix roles, updates based on latest draft
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- fixes to MCF reference documentation

- add support for detailed schema information (223)
- add thesaurus handling to ISO import(226)

* add metadata transformation workflow (186)
* MCF schema updates (187)
* fix ISO based distribution model (175)
* add WMO WCMP2 updates
* improve ISO contact parsing (207)
* add identification.license to MCF (205)
* update OARec themes/concepts model (213)
* add support for spatial keywords to MCF (202)
* streamline OARec contacts (215)
* update ISO parsing based on OWSLib 0.29