db_xml.py: Added internal next param used by simplifyPath. put_table(): Refactored to use outer parent_ids_loc var and modify that as needed rather than having to pass parent_ids_loc as a param to put_table_().

sql.py: put_table(): When calling strings.as_*table(), pass custom ustr that removes col renames and adds double quotes on plain strings

strings.py: as_*table(): Added ustr param to override the method (by default ustr()) used to convert each value to a string

sql_gen.py: MockDb.esc_value(): Use new strings.repr_no_u()

strings.py: Added repr_no_u()

sql.py: clean_name(): Also remove '`' (which is used by MySQL)

sql.py: esc_name_by_module(): Use new sql_gen.esc_name()

sql_gen.py: Added esc_name() and use it in MockDb.esc_name()

sql.py: next_version(): Use special chars in version part of name string for clarity

sql.py: mk_insert_select(): embeddable: function_name is first line of query for clarity, and to reduce length from including the column names. This also fixes the problem of double quotes around column names in the previous function_name.