Redmine#3251: document GMT hard time classes and sys.cdate/sys.date

(cherry picked from commit 171b4d0f66fc4bc5c94dbefc53593165c50a1a48)
classes.markdown: Fix there -> these typo

(cherry picked from commit cc157bae73a3cee3e62a642580be2ac6cb24ff2c)
no license needed for 25free

(cherry picked from commit 204b69c20681099737ea7d4f5955d109f46d18de)
Update troubleshooting guide with php.ini path workaround
Update troubleshooting guide with PHP memory_limit solution
Add tutorials.markdown and tutorials folder to 3.5
Merge pull request #182 from deb-cfengine/tutorial_updater

Add tutorials.markdown and tutorials folder to 3.5
Update information about package version selection.

Related to issue #3314.
(cherry picked from commit d247b2afd50dec425d629b8cefa8796258702ea2)
Merge pull request #171 from awsiv/3.5.x

Update troubleshooting guide with PHP memory_limit
Merge pull request #186 from kacfengine/3.5

[3.5] Update information about package version selection.
Add details about mon.*_diskfree values
Indicate units, and clarify calculated values
(cherry picked from commit 5d02a09b94af68356f5e275bf9bce0e34b582d76)
Deprecate host_licenses_paid
This is not used as of CFEngine Enterprise 3.5
(cherry picked from commit d3a805d324893bc4f700c7a35f4eb595e9c94524)
Merge pull request #191 from deb-cfengine/cherrypick_Nick_updates

Cherrypick nick updates
Link from mode to rxdirs and visa versa

(cherry picked from commit 2f668a33ab09d80074111512ef7228a81decab42)
Cherry-picking: Adding new primer to Tutorials section; updates links
Removed white space in code block
(cherry picked from commit 1f940a1ed8ffbbbeefe48140234cb6e1bd3dea8d)

Conflicts:
	examples/tutorials/new-users.markdown
Merge pull request #201 from deb-cfengine/CP_erikprimer

Cherry-picking: Adding new primer to Tutorials section; updates links
Add links to CFEngine 3.5, Getting Started, and Tutorials pages (new-users.html page)
Merge pull request #202 from deb-cfengine/primer_links

Add links to CFEngine 3.5, Getting Started, and Tutorials pages
Fixing documentation for call collect

The documentation mentioned "collect call", however the server
is sending "collect_calls". Fixed the documentation so it matches
reality.

PS This was correct in the older documentation, somehow it got
changed.

(cherry picked from commit 04e9217e2e3f9c47d7a62821a34b93206c90dde6)
Add documentation for process table cache in state dir

(cherry picked from commit 04393a424c0dd0c21f56e978eebd8e7495b3c686)