Add persp-get-by-name. Improve persp-frame-list-without-daemon.
Reorganize persp-mode definition and initialization. Use ad-enable-advice/ad-disable-advice
Cosmetic changes.
Update Readme.md
Improve iswitchb-mode support, customize definitions,readme. Fix find-other-frame-with-persp. Provide default variants for interactive functions that operate on perspectives
Fix mode initialization, persp-save-to-file. Set major-mode for buffers when loading from file.