v3.2.3+galaxy2 [2021-06]

This version still refers to FROGS_3.2.3 suit.

Modifications:

with help of @lecorguille

clean up xml code by using single quote, or python code following pep8 recommandations
init macros for version, requirement, logo and help
setup github actions for automatic galaxy testing
precise XML test sections
FROGS datamanager have been uploaded independently on the toolshed : https://toolshed.g2.bx.psu.edu/view/frogs/data_manager_frogs
See README to remove previous installation of the datamanager without loosing previous reference databases downloaded.