Improve and update documentation of search commands
* doc/emacs/search.texi (Lax Search): Renamed from "Search Case"; all references changed. Move the description of lax-whitespace here. Add description of the new character folding features and additional customizable options. (Isearch Yank): Move before "Error in Search". (Basic Isearch): Improve wording. Add index entries. Add short description of how to abandon search, making this subsection a complete introduction to search basics. (Repeat Isearch): Add index entries. Describe additional customizable options. Describe mouse clicks. (Isearch Yank): Add index entries. Describe mouse-2 click in echo area. Describe more customizable options. (Error in Isearch): Add index entries. (Special Isearch): Move actual description of some isearch commands to other sections, leaving here just the summary of the commands. Add command that toggles character folding. Describe commands, like "C-h C-h", that were previously omitted for some reason. (Not Exiting Isearch): Describe search-exit-option. Add index entries. (Word Search): Describe eww-search-word and eww-search-prefix. (Symbol Search): Add index entries. (Regexp Search): Describe regexp-search-ring-max. (Replacement and Lax Matches): Renamed from "Replacement and Case"; all references changed. Describe lax-whitespace matching in replace commands and related options. Describe character folding in replace commands and related options. (Query Replace): Describe query-replace-from-to-separator and the new history features. Add index entries for highlighted text. Describe query-replace-skip-read-only. Describe more keys accepted by query-replace. (Other Repeating Search): More index entries for Occur. Describe list-matching-lines-default-context-lines. (Search Customizations): New section, documents customizable options that were not documented until now. * doc/emacs/glossary.texi (Glossary): Add "Case Folding" and "Character Folding". * etc/NEWS: Move search- and replace-related entries to a single parent section. * lisp/replace.el (query-replace-show-replacement): Doc fix. * lisp/isearch.el (search-nonincremental-instead) (isearch-hide-immediately): Doc fixes.
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