Land Group Peat and Irrigation PR's

[biljanaorescanin]

This issue collects links to draft PRs with land model developments that were closed without merge.

The closed PRs will be needed again when development is restarted.

1. Peat: Feature/sm peat clm3 #417
2. Irrigation: Feature/sm irrigation model #420
3. Boundary conditions for peat, irrigation, river routing and interannually varying vegetation: Revisions to land bcs generation for peatlands (L4SM Version 6), river routing, irrigation, and interannually varying LAI, VISDF, NIRDF #413

An even older set of PRs bundled several land model updates:
#151
GEOS-ESM/GEOSgcm_App#68

@gmao-rreichle @rdkoster @sdrabenh @gmao-jkolassa

[biljanaorescanin]

Adding one more PR to this issue, this one is from GEOSgcm_App labeled science improvements PR#68

NOTE: This PR is not related to Peat or Irrigation updates.

[gmao-rreichle]

Reopening this issue because items 2 for irrigation and 3 for bcs have not yet been addressed.
Item 1 for peat and peat-related bcs changes in item 3 have been addressed with PR #524.

[biljanaorescanin]

Irrigation will be addressed with this PR: #959

Boundary conditions were addressed with v11 BCS release.