(diary-attrtype-convert): Convert an attribute value string to the desired type.

(diary-attrtype-convert): Convert an attribute value string to the desired type.
(diary-pull-attrs): New function that pulls the attributes off a diary entry,
merges with file-global attributes, and returns the (possibly modified) entry
and a list of attribute/values using diary-attrtype-convert above.
(list-diary-entries, fancy-diary-display, show-all-diary-entries)
(mark-diary-entries, mark-sexp-diary-entries, list-sexp-diary-entries): Add
handling of file-global attributes, add handling of entry attributes using
diary-pull-attrs above.
(mark-calendar-days-named, mark-calendar-days-named, mark-calendar-date-pattern)
(mark-calendar-month, add-to-diary-list): Add optional paramater `color' for
passing face attribute info through the callchain.  Pass this parameter around.