Patch for Bug #177403: "Amarok does not remove leading blanks in podcast"

[Nicholas Sinlock]

   In addition to stripping the leading blanks from podcast titles, I 
also implemented a function to remove any part of the channel title
that is also found at the start of the episode title, as in the case of 
Scientific American's 60 Second Science podcast, found
at http://www.sciam.com/podcast/sciam_podcast_r_d.xml.   I implemented 
that rather than using the decapitateString as the latter function
had the side effect of sometimes removing several characters from a 
word, effectively truncating a proper word into a non-proper word.

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