Allows user to concatenate two (or more) MSAs
This method allows the user to concatenate several MSAs into one MSA.
App Specification:
https://github.com/kbaseapps/kb_ObjectUtilities/tree/91de21a03769050ba28a83e1762261215d1d40de/ui/narrative/methods/KButil_Concat_MSAsModule Commit: 91de21a03769050ba28a83e1762261215d1d40de