Fix double slash in coral interwikilink

wikilink creating refactored to _resolveinterwiki().

Added DOKU_BASE for local target

added tests for Doku_Renderer::_resolveInterWiki

FS#1833 (b)
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 ta

FS#1833 (b)
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

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swap order ot test parameters to match expected,actual as per documentation & test output

update tests for use with <THEAD> changes

Wrap thead around 1st row, when 1st cell at 1st row is tableheader. Implements FS#1764

added unittests for rowspans at first table row

increase test coverage for code and file

code - test correct recognition of downloadable filename token
file - test correct recognition of syntax name & downloadable filename tokens

Simple test cases for code and file token fix

use correct setUp method and parent calls.

removed unecessary requiresin unit tests

moved _testing to _test