Add search to Erlang shell's history

Search mode can be entered by pressing ctrl-r. Enter terms and press
ctrl-r again to search backwards, or ctrl-s to then search forward (if
you terminal doesn't eat up that one). Press enter to execute the line,
or use tab, arrow keys, or other control sequences (^D, ^K, etc.) to
exit search mode while remaining on the last found line. Exiting is also
possible by pressing the escape key twice.

The search mode is a simpler version of the one available in bash or
zsh shells.

This adds a few modes to the shell (search, on top of none and meta) in
group.erl for history search, and a few more in edlin.erl to change the
meaning of control sequences while searching.
Merge branch 'dg/win_icon' into master-pu
Merge branch 'lf/snmp-tuple-fun' into master-pu
Merge branch 'lf/snmpm_user_default' into master-pu
Merge branch 'jd/file-ram-opt-doc' into master-pu
Merge branch 'avi/fix-os-cmd-win' into master-pu
Merge branch 'id/snmp_optimization' into master-pu
Merge branch 'sk/odbc64' into master-pu
Merge branch 'ks/ssl-fix-most-unmatched_returns' into master-pu

Conflicts:
	lib/ssl/src/ssl_connection.erl
Merge branch 'fh/shell_history_search' into master-pu
Merge branch 'kp/odbc-empty-params' into master-pu
Merge branch 'sal/ftp' into master-pu
Merge branch 'kp/odbc-oracle-autocommit-fix' into master-pu
Merge branch 'jv/cover-patches' into master-pu
Merge branch 'ta/fakefop' into master-pu
Merge branch 'sal/float_to_list_2' into master-pu
Merge branch 'hsv/http_redirect_on_post_303' into master-pu
Merge branch 'nox/scan-end-locations' into master-pu