UI cleanup, phase 2 (partially cosmetic)

UI cleanup, phase 2 (partially cosmetic)

One of several commits that are intended to "clean up" parts of
the TomatoUSB GUI.  Expect more in the future (some are hard to
test).  Non-cosmetic changes are denoted with an asterisk (*).
Changes:

about.asp
  - Move "Built on" date under version and bold text
admin-log.asp
  - Remove parens on things that denote units (ex. minutes, seconds)
admin-upgrade.asp
  * Add display of FW build date (NVRAM os_date)
  - Bold version text
advanced-vlan.asp
  - Add Notes section sub-headers for each respective area
  - Fix capitalisation on LAN port order issue description
  - Add trailing periods where applicable
  - HREF links need to be quoted
  - Bold word "must", not italicise
  - Some general HTML cleanup (superfluous small, etc.)
  - Addition of some HTML and JS comments to reflect things such
    as "double div" closure (this is intentional!) and similar
advanced-wlanvifs.asp
  - HREF links need to be quoted
basic-ddns.asp
  - Add Notes section covering "@IP" string/parameter in URL field
  * Remove custmsgX nonsense; nothing uses truly uses it
bwlimit.asp
  - Add Notes section covering IP/IP Ranges/MAC Address field syntax
  - IPs, not IP's (no apostrophe)
ipt-daily.asp
  - Lowercase "Comma"; consistent with rest of GUI
ipt-details.asp
  - Lowercase "Comma"; consistent with rest of GUI
ipt-monthly.asp
  - Lowercase "Comma"; consistent with rest of GUI
nas-ftp.asp
  - Use "/sec" instead of "/s" (consistent with more of GUI)
qos-ctrate.asp
  - Change "Proto" to "Protocol" in table; consistent with rest of GUI
qos-detailed.asp
  - Change "Proto" to "Protocol" in table; consistent with rest of GUI
  - Lowercase "Comma"; consistent with rest of GUI
qos-settings.asp
  - Lowercase "Comma"; consistent with rest of GUI
  - Lowercase "Set"
  - Remove extraneous spaces (HTML doesn't work that way)
vpn-pptp-server.asp
  - HREF links need to be quoted