e_table_specification_new() now takes a table specification filename and
a GError and parses the file as part of instance creation. If a file or
parse error occurs, e_table_specification_new() returns NULL.
This replaces e_table_specification_load_from_file().
New functions:
e_table_specification_get_filename()
Removed functions:
e_table_specification_load_from_file()
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