input.Makefile: input.Makefile: Use `$(catSrcs)|` instead of $(withCatSrcs) where possible

sql.py: pkey(): Fixed bug where results were not being cached because the rows hadn't been explicitly fetched, by having DbConn.DbCursor.execute() fetch all rows if the rowcount is 0 and it's not an insert statement. DbConn.DbCursor: Made _is_insert an attribute rather than a method, which is set as soon as the query is known. Added consume_rows(). Moved Result retrieval section above Database connections because it's used by DbConn.

sql.py: pkey(): Fixed bug where queries were not being cached. Use select() instead of run_query() so that caching is automatically turned on and table names are automatically escaped.

streams.py: Added LineCountInputStream, which is faster than LineCountStream for input streams. Added InputStreamsOnlyException and raise it in all *InputStream classes' write() methods.

sql.py: DbConn: For non-cacheable queries, use a plain cursor() instead of a DbCursor to avoid the overhead of saving the result and wrapping the cursor

Moved db_config_names from bin/map to sql.py so it can be used by other scripts as well

csv2ddl: Also print a COPY FROM statement

input.Makefile: Fixed bug where input type was considered to be different things if both $(inputFiles) and $(dbExport) are non-empty. Now, $(inputFiles) takes precedence so that the presence of any input files will cause a DB dump to be ignored. This ensures that a (slower) input DB is not used over a (faster) flat file.

csvs.py: stream_info(): Added parse_header option. reader_and_header(): Use stream_info()'s new parse_header option.

csv2ddl: Renamed schema name env var from datasrc to schema to reflect what it is, and to make the script general beyond importing inputs