/!\ LOCAL_URL and relative paths (read below)
-SHOULD- fix issue #2:
* LOCAL_URL is now absolute URL based on: protocol-HTTP_HOST-REQUEST_URI
* media export reference url change
* media is now stored as RELATIVE:  "media/blablabla.jpg"
* escape_content ENFORCES RELATIVE: "./media/blablabla.jpg"

This commit MAY AFFECT DATABASE VALIDITY. In case of doubt, export-remove-import autoblogs or use SQLite editor to ensure all media links are relative like "media/somestuff.jpg"