Tidy up "vpn_ipsec_phase1.php" XHTML

Add CDATA sections to SCRIPTS
Add SUMMARY to TABLES
Update HTML Boolean operators
Close INPUT tags
Update links in "vpn_ipsec.php"

Update help links in "vpn_ipsec.php" to point to the correct page.
PBIs are crashing without LOGNAME being defined in the environment, define it here until PBI is fixed
Merge pull request #1151 from ExolonDX/branch_master_02
Merge pull request #1150 from ExolonDX/branch_master_01
Allow to use PSK+agressive mode since user should have the choice even though it poses security risks