SPECS update fork Bretonniere
Add SPECS patch doc
Update of tables, few changes in code (SPECS project keyword, attributes list) and bug corrections (time->leadtime in case of file appending in cmor_write)
Update to comply with latest SPECS conventions (global attributes and double time axis
Update to last changes in SPECS conventions (leadtime + verification time, start date in file name)
Resolving merge conflicts between SPECS and official branches
Resolving last merge conflict
Typo correction (unclosed brace)
Fixed merge conflict with origin master
Merge branch 'pab' into devel