update dependency specs

due to changes in virtualenv and setuptools, this package causes failure on install when used as a dependency in other packages. fixing the pandas version spec corrects this issue. we also loosened the selfies and crem version specs to be more permissive.

loosen loguru version restrictions

allows us to use older version of deriver with newer version of loguru

efficiency update to filters

changes from @jrsacher

• improved filtering slightly
• added some new calculated values, which default to being ignored by the filtering code unless manually specified

backport logging changes to 2.7.x branch

make our loguru configuration optional instead of mandatory.

v2.8.0

update to 2.8.0 expose more of local space method API