Merge dev info kaguyatc (#3243)

* Added gtests for Displacement.cpp, removed Displacement unitTest and truthfile. (#3209)

* Added BasisFunctionTests.cpp. Removed BasisFunction unit test and truthfile.

* changed expectedOutput values for some of the tests

* Made tests for Displacement.cpp using gtest. removed Displacement unitTest and truthfile.

* Updated README data area instructions (#3214)

* Fixed data area instructions in README and some links

* Fixed bold in block quote

* Fixed legacy install guide link

* extra l

* Testing indentation list

* Testing indentation list again

* Testing indentation list code snippet

* Minor wording clean up

* Removed extra number

* Removed duplicate Mars Odyssey entry

* Updates to the build recipe for ISIS releases for the 3.7.0 release candidate. (#3205)

* Minor modifications for RC build

* Small modification to version in the recipe/meta.yaml

* Updating release stage in isis/version

* Added Area3DTests.cpp (#3216)

* Added BasisFunctionTests.cpp. Removed BasisFunction unit test and truthfile.

* changed expectedOutput values for some of the tests

* Made tests for Displacement.cpp using gtest. removed Displacement unitTest and truthfile.

* Added Area3DTests.cpp, removed Area3D truthfile and unit test.

* included TestUtilities.h for use with exception testing, added a test for teh Area3D '=' operator

* changed formatting to adhere to USGS coding standards

* re-addedd the unit test and truth file

* gllssi2isis Original Label Fix (#3226)

* Allowed writting of residuals when value is zero to controlnet pvl

* Updated ControlNetVersioner unit test

* Fixed pvl labels original pvl labels not being written to the resulting cube.

* Updated docstrings and history for updated methods

* Removed the need to set the output cube pixel type

* Reverted proceeimport changes

* Set the dimensions in the process before processing

* Added missing 1 in a history record

* Reverted and applied a more appropriate fix

* Used outfile obtained at the beginning of the program

* Added history comment to app xml

* Removed accidental comma (#3230)

* Update README.md (#3232)

Update readability

* Modifying files for conda build for ISIS3.7.0_RC2 (#3229)

* Modifying files for conda build for ISIS3.7.0_RC_2

* Changes to modifications until issue #3231 can be completed

* Small typo

* One final added comment for clarification