Merge branch 'master' of https://github.com/Ensembl/plant-scripts

Merge branch 'master' of https://github.com/Ensembl/plant-scripts

Merge branch 'master' of https://github.com/Ensembl/plant-scripts

fixed conda EXE_GSAPATH handling

fixed conda EXE_GSAPATH handling

default EXE_GSAPATH is '' so that it works in conda

fixed conda EXE_GSAPATH handling

default EXE_GSAPATH is '' so that it works in conda

sub check_installed_features tests EXE_GFFREAD with -h

prepare for conda