Refactor.

Refactor.

Rename the parameter of type 'abstract_catalog_reader_ty *' to catr.
Rename the parameter of type 'default_catalog_reader_ty *' to dcatr.
Rename the parameter of type 'msgfmt_catalog_reader_ty *' to mcatr.

* gettext-tools/src/read-catalog-abstract.h (abstract_catalog_reader_class_ty):
Change first parameter name of all methods.
(struct catalog_input_format): Likewise.
(catalog_reader_parse, catalog_reader_free): Change first parameter name.
* gettext-tools/src/read-catalog-abstract.c (catalog_reader_alloc): Rename local
variable 'pop'.
(catalog_reader_free, call_parse_brief, call_parse_debrief,
call_directive_domain, call_directive_message, call_comment, call_comment_dot,
call_comment_filepos, call_comment_special, parse_start, parse_end,
catalog_reader_parse): Change first parameter name.
* gettext-tools/src/read-catalog.h (default_constructor, default_destructor,
default_parse_brief, default_parse_debrief, default_directive_domain,
default_directive_message, default_comment, default_comment_dot,
default_comment_filepos, default_comment_special, default_set_domain,
 default_add_message): Change first parameter name.
* gettext-tools/src/read-catalog.c (call_set_domain, call_add_message,
call_frob_new_message, default_constructor, default_destructor,
default_parse_brief, default_parse_debrief, default_copy_comment_state,
default_reset_comment_state, default_directive_domain,
default_directive_message, default_comment, default_comment_dot,
default_comment_filepos, default_comment_special, default_set_domain,
default_add_message): Change first parameter name.
* gettext-tools/src/msgfmt.c (msgfmt_constructor, msgfmt_parse_debrief,
msgfmt_set_domain, msgfmt_add_message, msgfmt_frob_new_message,
msgfmt_comment_special): Change first parameter name.
(read_catalog_file_msgfmt): Rename local variable 'pop'.
* gettext-tools/src/x-po.c (extract): Rename local variable 'pop'.
* gettext-tools/src/xgettext.c (exclude_directive_domain,
exclude_directive_message): Change first parameter name.
* gettext-tools/src/read-po.c (po_parse): Change first parameter name.
* gettext-tools/src/read-properties.c (properties_parse): Likewise.
* gettext-tools/src/read-stringtable.c (stringtable_parse): Likewise.