Fixes problem stopping haproxy

We've experienced problems stopping haproxy from web gui. From command line it said that haproxy was not found.

I found that the path to the executable was not right, and fixed it.
haproxy-devel, make stats-tab refresh timers configurable.
haproxy-devel,
-fix sslcheckbox that was automatically turning on when editing
-allow 2nd clones to be linked to the original primary frontend when making them shared
squid3-dev - merge captive portal squid helper contribution by forum user dig1234
https://forum.pfsense.org/index.php?topic=72443.msg395218#msg395218
point package files to https://packages.pfsense.org, file downloads to https://files.pfsense.org, links to www, forum, etc. s/http/https/
remove references to files that haven't been around in a number of years.
haproxy-devel, handle carp master/backup plugin event for faster response when the haproxy process needs to be started
haproxy-devel, corrections for memory requirements and link to 'System Tunables' for high connection counts.
Merge pull request #610 from cyberplant/patch-1

Fixes problem stopping haproxy-devel
Merge pull request #624 from PiBa-NL/hap_memory_requirements

haproxy-devel, corrections for memory requirements and link to 'System Tunables' for high connection counts.
haproxy-devel, type in var: excludefrontent > excludefrontend
Merge pull request #618 from PiBa-NL/hap_stats_timers

haproxy-devel, make stats-tab refresh timers configurable.
Merge pull request #619 from PiBa-NL/hap_small_fixes

haproxy-devel,fix sslcheckbox from automatically turning on, allow immediate frontend sharing when duplicating
haproxy-devel, place lock while starting, to prevent the startup script starting haproxy twice and loosing track of already running pid's.
haproxy-devel, xmlparser needs 'item' for array elements
Merge pull request #623 from PiBa-NL/hap_carp_eventhandling

haproxy-devel, handle carp master/backup plugin event for faster response when the haproxy process needs to be started
Merge pull request #625 from PiBa-NL/hap_starting_lock

haproxy-devel, place lock while starting, to prevent the startup script starting haproxy twice and loosing track of already running pid's.