gst/gstvalue.c: add serialization and comparison functions for long, int64, enum...

gst/gstvalue.c: add serialization and comparison functions for long, int64, enum and float values

Original commit message from CVS:
* gst/gstvalue.c: (gst_strtoll), (CREATE_SERIALIZATION),
(CREATE_USERIALIZATION), (_gst_value_initialize),
(gst_value_compare_float), (gst_value_serialize_float),
(gst_value_deserialize_float), (gst_value_compare_enum),
(gst_value_serialize_enum), (gst_value_deserialize_enum):
add serialization and comparison functions for long, int64, enum and
float values
* gst/gstvalue.c: (gst_value_serialize), (gst_value_deserialize):
use best serialization function in type hierarchy instead of only a
matching one. This is required for enums to work.
* gst/parse/grammar.y:
use gst_caps_deserialize
* testsuite/parse/Makefile.am:
parse1 now works
* testsuite/parse/parse1.c: (main):
remove aggregator check, aggregator is broken, this test works now
but fails because of bug #138012
* testsuite/parse/parse2.c: (main):
s/xvideosink/xvimagesink - this test looks a lot like we should
disable it