Define lstchain 0.7.1 in setup and tests

See merge request cta-array-elements/lst/analysis/lstosa!54

Env file

See merge request cta-array-elements/lst/analysis/lstosa!53

Check if dl1 file is symlink before removing

See merge request cta-array-elements/lst/analysis/lstosa!52

DL1 file removing only once

See merge request cta-array-elements/lst/analysis/lstosa!51

Include only cache paths if defined in cfg

See merge request cta-array-elements/lst/analysis/lstosa!50

Add cache dirs for ctapipe and matplotlib

See merge request cta-array-elements/lst/analysis/lstosa!49

add comment to install master version of lstchain

See merge request cta-array-elements/lst/analysis/lstosa!48

Remove ctapipe extra from env

See merge request cta-array-elements/lst/analysis/lstosa!47

DL2 subdir

See merge request cta-array-elements/lst/analysis/lstosa!46

# Conflicts:
#   osa/scripts/closer.py
#   osa/utils/register.py

Closer fix

See merge request cta-array-elements/lst/analysis/lstosa!45