(eval-when-compile): Remove unnecessary load of 'cl. Add fset of

(eval-when-compile): Remove unnecessary load of 'cl.  Add fset of
allout-real-isearch-abort during compile to alleviate unnecessary
byte-compilation warnings.
(allout-mode-p): Move definition of this macro above all uses, or
byte compilation in barren emacs (eg, during emacs build) will
lack the definition.
(allout-mode): Move this variable above any uses, or byte
compilation will fail.
(allout-resolve-xref): Remove use of personal file-reference
function.
(allout-toggle-current-subtree-encryption): Do the current (ie,
visible containing) topic, rather than nearest around point.
Doc fix.
(allout-toggle-subtree-encryption): New function, workhorse that
works on nearest topic containing point.
(allout-encrypt-string): Signal requirement for newer version of pgg.
(allout-resumptions): Doc fix.