Fix errors in CEDET 1.0 merge.

Fix errors in CEDET 1.0 merge.

* semantic/tag.el (semantic-tag-version): Bump to 2.0.

* semantic/db-typecache.el (semanticdb-typecache-find-default):
* semantic/imenu.el (semantic-create-imenu-index):
* semantic/grammar.el (semantic--grammar-macro-function-tag):
* semantic/fw.el (semanticdb-without-unloaded-file-searches): Fix
require.  Suggested by David Engster.

* semantic/bovine/c-by.el: Regenerate.

* semantic/lex-spp.el (semantic-lex-spp-debug-symbol): New var.
(semantic-lex-spp-enable-debug-symbol): New command
(semantic-lex-spp-value-valid-p)
(semantic-lex-spp-validate-value): New functions
(semantic-lex-spp-symbol-set)
(semantic-lex-spp-symbol-push): Add call to validate value.
(semantic-lex-spp-table-write-slot-value): Instead of erroring on
invalid values during save, just save a nil.