Granulemeta

- [Improved how netCDF variables are extracted as metadata](fda7df924629a67be16ba54b1c3b0b8792f2ea81)
- [Removed unnecessary debug/dev code](5533bf9a80b7055937ce74472ae8d526aba89aa6)

- [stability and reliability fixes and minor new features](81642fc67750bc4faedcb1c28d409500f7404764)

- [added dev docker container](01efbda7cc3199491f2d2d35abe48e98783f8499)
- [minor code tweak](52fc3dc96ebbdabc07f96f120b129e27375d747c)
- [fixed formatting and documentation](55aa41b15cbe70c4b4e7dd9e871568a1b23f2f91)
- [fixed more formatting and documentation](68891df9b882d71b5c47b5638d45058da16b34e9)
- [added warning for when no metadata produced for a given granule](1f9367eec8f7c2ea97bdee55520057374865a298)
- [added warnings to gmout for some specific missing or negative values](dad83fee55be8581be7c6d1eecada9c573f5689f)
- [fixed some start & end time bugs](4dc200c47bb8d43b65b51966266bc106d1749002)

- [major update. (now handles every granule type V2 handles)](6c1970a231d9157325ef796c2c44c88f09fd5e48)

- [initial commit (only handles ENVI, netCDF & HDF granules)](63ffba2e85d63260150ba152b8cc131d5033cbc2)