update gitignore
created master routine for single-rowed metadata files

This version prompts user to indicate whether the metadata file is
single- or multi-rowed (i.e. whether there is a metadata row for each
UMDM/UMAM or only one row per object).  If the latter is selected, this
version has a simplified routine for generating UMAM, METS, UMDM, then
inserting METS into UMDM.  This commit also contains sample output
files from a test run of this version of the script using PIDs from the
staging server.