Release of version 1.7.3

• sped up read_io()
• rework LPJmLGridData implementation
• get_cetllindex() utility function
• support for LPJmL reservoir input files
• better documentation
• bug fixes

Release of version 1.0.11

• small bug fixes (data type naming, usage of fancy quotes)
• version matching CRAN release

Release of version 1.0.0

Merge branch 'major_upgrade' into 'master'

major update to version 1.0.0, rearranging code, introducing deprecation to some arguments

See merge request lpjml/lpjmlkit!59