input.Makefile: Merged Installation and Staging tables sections into Staging tables installation, since no other installation is performed. Removed "import/" prefix from non-file import-related targets.

inputs: Moved test outputs into subfolders, using the steps at <https://projects.nceas.ucsb.edu/nceas/projects/bien/wiki/VegCSV_subfolders#Move-test-outputs-into-subfolders>

input.Makefile: Import to VegBIEN: Removed extra test for $(inputFiles), because when there are no inputs, $(tables) will be empty and import will automatically do nothing. Removed no longer needed $(inputFiles).

inputs: Moved maps into subfolders, using the steps at <https://projects.nceas.ucsb.edu/nceas/projects/bien/wiki/VegCSV_subfolders#Move-maps-into-subfolders>

inputs: Replaced Veg+ prefix with map on via maps, using the steps at <https://projects.nceas.ucsb.edu/nceas/projects/bien/wiki/VegCSV_subfolders#Replace-Veg-prefix-with-map-on-via-maps>

strings.py: concat(): Apply length limits by shrinking max_len by new raw_extra_len() of the strings. This also fixes a bug where multi-byte characters in str0 were not properly taken into account, leading to overly long strings. Added doc comment.

strings.py: Added raw_extra_len()

sql_gen.py: NoUnderlyingTableException: Take a (required) parameter for the item that had no underlying table, and provide this wherever a NoUnderlyingTableException is created

strings.py: concat(): Perform substring operation on Unicode strings so that substring does not split Unicode characters. Still use to_raw_str() to calculate the str1 length because Unicode characters can be multi-byte, and length limits often apply to the byte length, not the character length.

exc.py: add_msg(): Fixed bug where needed to convert the Unicode string back into a raw string because Python's top-level exception handler doesn't support Unicode strings as exception messages