Full implementation of EBV with error propagation via MSC

[astrochun]

Implementation on feature/commons_error_prop

WIP issue to ensure that Zcalbase_gal operates with MSC after the latest release feature a full implementation of EBV with error propagation

Here's a list of action items to address and testings to perform:

• [x] Remove hard-coded filepath in stackboth_mastergrid

• [x] Pass fitspath and fitspath_ini into stackboth_mastergrid and ...

• [x] Switch from variable inputs toward optional keywords where possible [4bdee67]

  • [x] general: y_correction, mask, n_split

• [x] Rename certain keywords for interoperability

  • [x] general: dustatten -> apply_dust [4bdee67]

• [x] Change default settings for keywords to make sure they are executed as intended

  • [x] general: 4bdee67

Using MSC codes:

• [x] general.gettime can be replaced with MSC's dir_date

Dust attenuation and error propagation tests:

• [x] Raw data
• [x] Raw data, dust corrected -> resulted in nan for T_e for first bin (consistent in both Chun and Reagen)
• [x] MC, original validation table
• [x] MC, revised validation table
• [x] MC, dust corrected, revised validation table