[SCM] gmt branch, master, updated. upstream/4.5.5-13-g2b12d98

[Francesco Paolo Lovergine]

The following commit has been merged in the master branch:
commit e57e2197942a56c2885d18f102d6ee710c20c9c5
Merge: 534ed2a094ce005e59dbe330ae2f1f84443336bf 6797941eb14b4f7fde758a1d8359828339a6a8a1
Author: Francesco Paolo Lovergine <frankie at debian.org>
Date:   Wed Mar 7 10:01:26 2012 +0100

    Merge tag 'upstream/4.5.7'
    
    Upstream version 4.5.7
    
    Conflicts:
    	doc/pdf/GMT_Docs.pdf
    	upstream/GMT4.5.5_doc.tar.bz2
    	upstream/GMT4.5.6_doc.tar.bz2


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