Removed ErgoEmacs section since ErgoEmacs' search at point commands have been removed.
Removed "Another implementation of isearch-forward-at-point". It is broken in recent emacs: it opens isearch with no search string. It also seems hackish.
Rearanged section "search for the current regexp as a whole symbol" to be more clear, as it sort of doesn't belong on this page as it has nothing to do with what is "at the point".