add function to convert -99 to NA
add minus992na() to export()
changed format for reading NASA POWER files
Added specific formatting for reading NASA POWER files
bugfix
bugfix
fix format in cropsim.fmt()
changed format in cropsim.fmt()
bugfix
bugfix
bugfix
bugfix
bugfix
lots of bugfixes
bugfix
Lots of changes...mostly bugfixes
Lots of changes