basestring, range, long, url*, parse*, unicode, html_unescape
also, remove some obsolete sys.version checks

All copyright holders have given their consent.

This reverts commit 3c84980e.

* Sort alphabetically modules in weboob linting script
* Remove btdigg module, as btdigg website is dead.
* Add icons for all modules with a missing icon.
* Add some unittests for LDLC.

When the balance is low, the span class is "low-balance" and not
balance. Use 'contain' to be more robust

weboob.tools.browser -> weboob.deprecated.browser
weboob.tools.parsers -> weboob.deprecated.browser.parsers
weboob.tools.mech -> weboob.deprecated.mech
weboob.browser2 -> weboob.browser
weboob.core.exceptions -> weboob.exceptions

Also, the new tree for browser2 is:

weboob.browser: import weboob.browser.browsers.* and weboob.browser.url.*
weboob.browser.browsers: all browsers (including PagesBrowser and LoginBrowser)
weboob.browser.url: the URL class
weboob.browser.profiles: all Profile classes
weboob.browser.sessions: WeboobSession and FuturesSession
weboob.browser.cookies: that's a cookies thing
weboob.browser.pages: all Page and derivated classes, and Form class
weboob.browser.exceptions: specific browser exceptions
weboob.browser.elements: AbstractElement classes, and 'method' decorator
weboob.browser.filters.*: all filters