source maps are invalid for our dispatched sources and may even cause
problems. this makes sure any sourcemap declarations are stripped from
the output

This very basic test ensures that the useCache method works as
expected for simple scenarios. This test case fails without commit
a8795974 and then also triggers the
warning that was introduced in bc2ddb54

Mostly this is for unit tests which use of \$_SERVER['REMOTE_USER']

It ensures the reference/alias connection between \$INPUT->server
and \$_SERVER is renewed before each test.  Tests using TestRequest
class will replace this \$INPUT with their own.

double slashes in url() always have to be ignored

Added DOKU_BASE for local target

if a needed CONNECT tunnel fails

connections are now retried after timeout and failing connections will
be marked as skipped instead of failing. This should reduce false alarms
on travis

add test case new Input check
add global variables to execute

this should help with applying pull requests that do come not from the
translation interface as it makes sure the files will be at least
syntactically correct.

Since a8dba452 the search index didn't
properly index numeric words anymore, instead they were added as new
words to the word list each time they were indexed, leading to an
ever-increasing index size.

This fixes sending empty and duplicated To/Cc/Bcc, Subject and From
headers in the additional headers. The To-header in the additional
headers prevented mail sending on some systems.

Prevent table entry syntax swallowing multiple preceeding blank lines
(a) this shouldn't be necessary, blank lines are handled by paragraph
    processing
(b) avoids issues with greedy table syntax competing with plugins

With unit tests

One case is not yet fixed:
when rev1 is first rev from changelog, only $max/2 revisions are
retrieved, but it should retrieve $max revisions.