Prerelease for v1.1.0

[paolap]

New version 1.1.0

Main changes:

• improved data range and files handling including tests
• added new AM3 version (still in development mode)
• added calculation for geopotential height from height above sea level
• added documentation for calculations to docs
• reviewed current mapping so pressure levels variables are defined in a consistent way
• improved handling of axes using mopper.db to store expected cmor axes
• mopdb varlist, template and intake don't need anymore the argument 'match'. The tool will try to work out patterns on its own.