Item11218: Improvements to MediaWiki converter

See attached patch for the following changes (take what you like):

• doesn't exclude everything if only an exclude pattern is specified
• changes in debug/warn messages
• --original flag to save/discard mediawiki text
• redirects check for clashes
• redirects as redirect pages and not normal pages
• skipping pages starting with /
• using the cumulative flag
• handling multiple images on the same line
• handling links to images
• handling non-images starting with :?Image:
• putting ! before WikiWords that aren't links
• --hash=0 flag for unhashed image stores
• removing explicit link when it can be made from the linktext
• removing the web name when the link target is in the same web
• checking namespace validity in links

-- JayenAshar - 30 Oct 2011

-- JayenAshar - 30 Oct 2011

forgot to add my sample command line: ./mediawiki2foswiki --file /tmp/itwiki.xml --web HelpDesk --language en --images /tmp/itwiki.images --topicmap MainPage=WebHome --exclude '^(MediaWiki|Image|Category|ITwiki|FCU):' --defaultweb _FoswikiPedia --cumulative --hash=0

-- JayenAshar - 30 Oct 2011

made an assumption that the getTitle/getCamelCase functions did the same text conversion as Render::_handleSquareBracketedLink, so "removing explicit link when it can be made from the linktext" isn't actually true. option 1 was to call something in render that converts from linktext to topicname, but i couldn't find such a subroutine. option 2 was to remove this "improvement" but i rather like it. option 3 was to add a hack to use the linktext when it contains a hyphen ('-'). (see v2 attachment.)

let me know if there is a function (in Render or otherwise) that converts linktext to topicnames. thanks.

-- JayenAshar - 30 Oct 2011

additional changes in a newly attached patch:

• doesn't nest pre blocks if a line starting with whitespace is in a pre block
• anchor links aren't interpreted as numbered lists

improvements to a few other things:

• putting ! before WikiWords that aren't links
• removing explicit link when it can be made from the linktext

-- JayenAshar - 13 Nov 2011

more changes:

• warns if a page has an unequal number of pre and /pre
• uses MediaWiki::DumpFile instead of Parse::MediaWiki
• uses Foswiki::Func and Foswiki::Meta for creating webs, saving topics, adding attachments
• --revisions for copying (not converting) old revisions
• convert 
 to br/

more hacks:

• deletes WebHome after copying, because rcs won't allow a newer revision with an older date
• convert < to &lt; (and >)

-- JayenAshar - 17 Dec 2011

more changes:

• initializes ALLOWWEBVIEW in the new web (requires patch as per Item10685)
• converts tables to HTML, so the wysiwyg can use them. requires MediaWikiTablePlugin, but i didn't know how to modify the installer file.

-- JayenAshar - 18 Dec 2011

more changes:

• better handling of nowiki inside lines starting with spaces

-- JayenAshar - 25 Dec 2011

one more change:

• in case the namespace has a space in it

-- JayenAshar - 21 Jan 2012

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