SpacePHARER Release 5-c2e680a

Changes since Release 4-228b9e5:

New features

• Add spacer dataset spacers_dion_et_al_2021 from Dion et al. (2021) in downloaddb

Bugs fixed

• Fix various small memory leaks
• Fix typos
• Fix issue in parsing spacer input in CRT/MinCED format
• Fix issue in handling empty file input
• Fix downloaddb not working when SpacePHARER was called from $PATH instead of a relative or absolute path