First check point.#6

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nastasi wants to merge 8 commits intosplitbrain:masterfrom

Commits on Mar 9, 2012

layers management added
Matteo Nastasi (mop)
committed
dpi attribute management added
Matteo Nastasi (mop)
committed

Commits on Mar 10, 2012

dpi array element moved at the bottom of assigments
Matteo Nastasi (mop)
committed

Commits on Mar 11, 2012

use php function getimagesize instead of identify program call
Matteo Nastasi (mop)
committed
add author reference
Matteo Nastasi (mop)
committed
splicespace mode added to show layers as a stack
Matteo Nastasi (mop)
committed

Commits on Apr 8, 2012