Tidy up "interfaces.php" XHTML

Close BR and IMG tags and add ALT statement to IMG tags
Change ONCLICK and ONCHANGE to lower case.
Add CDATA section to SCRIPT tags
Tidy up "pkg_edit.php" XHTML

Close BR and IMG tags and add ALT statement to IMG tags
Change ONCLICK to lower case
Move "fbegin.inc" PHP statement before the SCRIPTS
Add CDATA sections to SCRIPT tags
Tidy up "pkg.php" XHTML

Move SCRIPT tags out of the TABLE tag
Add CDATA section to SCRIPT tags
Close INPUT and IMG tags and add ALT statement to IMG tags
Update HTML boolean operators
Move NOWRAP to class statement
Deprecate ampersand in ANCHOR tags
Add missing closing FONT tags
Swap closing TR and TD tags
Merge pull request #557 from ExolonDX/branch_01

Tidy up "interfaces.php" XHTML
Merge pull request #558 from ExolonDX/branch_02

Tidy up "pkg_edit.php" XHTML
Merge pull request #559 from ExolonDX/branch_03

Tidy up "pkg.php" XHTML
make fe80 gateway check case-insensitive
Make fe80: addresses check case insensitive
Fix whitespaces and indent
Add a new parameter to return all aliases, including hosts. It fixes #2941
Update pkg_edit.php

Correct CDATA section in SCRIPT tag
Update pkg_edit.php

Correct CDATA sections in SCRIPT tag
Correct ALT statement in IMG tag
Merge pull request #561 from ExolonDX/branch_02

Update pkg_edit.php
Make fc00::/7 private address space exclusion case insensitive
Merge pull request #562 from N0YB/Bogonsv6_Private_Case

Make fc00::/7 private address space exclusion case insensitive
Notify user that static arp will be configured even if DHCP server is disabled
Tidy up "pkg_edit.php" XHTML

Close INPUT tags
Update HTML boolean operators
Add missing start TR tag
Remove "name" statement from OPTION tag, invalid in XHTML
Remove duplicate "id" statement in SELECT tag
Tidy up "interfaces.php" XHTML

Close INPUT tags
Add closing FONT tag
Merge pull request #563 from ExolonDX/branch_01

Tidy up "interfaces.php" XHTML
Fix whitespace and indent