Beginning of Page pages refactoring.

Added ProofreadPagePage and ProofreadPageValue classes.

Change-Id: I52f69ac806929f4cba0f1c9399d2519165d96086
Added unit tests for Page pages.

Change-Id: Ic80a32efc181c2b9b963653bdf2fbced56576706
Separation of rendering part from ProofreadPage.body.php.

Change-Id: I8cc6177e88d1ea3dff75b00d239ab44ae28b904b
Addition of code that will be used for setting up of editing system in PHP instead of JS.

Change-Id: I62b10d3d23d3282c36babdab364f4b97a6f2c85e
Moved the whole display of fields to PHP.

Image works on edit page, not on read or separate image page.

Change-Id: I6d5d75a98e87522d067fb09439befcb4cb83b7c6
Toggle header-footer visibility.

Change-Id: Ia9f69ebbe309f824f29e52962e95e5311b8221f0
Removed JavaScript which is to be rewritten.

Change-Id: I778735884dda1a8fbfa6f1d13934d9a65acadcb9
Display of page shifted to ProofreadPagePage class.

Change-Id: I8b6482723ecf21ce5bb045130c3ac17d6c0d9ef2
Moved the display of links to previous, next and index page to PHP.

Change-Id: I58983f1bd4300d599e9e6787d50b2495af315e9d
Added the zoom library jquery-panzoom.

Change-Id: I5831618a5c0d4c23ceab4cedc1633c9a24831326
Merge branch 'gerrit/master' into pagePagesRefactoring

Change-Id: I07fe43e477f46b24fce3f87601727bacc22056bb
Added zoom buttons to the toolbar.

Change-Id: I26d017b1f4556efb83eeb1aa924e1b7e72118dfe
Merge "Added zoom buttons to the toolbar." into pagePagesRefactoring
Fix a fatal error when the Page image doesn't exit

Improve code of the addition of pref and next links to Page: pages
Use the same order as the old interface

Change-Id: I9df4eac6252b59736b1080e15d0cabf759547f2c
Improve image transformation parameter normalisation

Change-Id: I188858e139694cd3e132a6fbcb085e292f1eb834
Implement ContentHandler facility for page pages

Change-Id: Ia75b61d191b75bd79073c843f3bd94c83acf6c5a
Merge "Implement ContentHandler facility for page pages" into pagePagesRefactoring
Merge "Improve image transformation parameter normalisation" into pagePagesRefactoring
Major refactoring of the JS part of the page edition system

Reduce size of module folder names.
Create a new module specific for the edition of page pages.
Improve the page edition UI
Fix a small bug with Page: without index page

Change-Id: I8195325d7b17b3675792139f43593ee50e6e7096
Add icons for pref, next and index navigation links to the Vector skin

Improve also the documentation of the JS part

Change-Id: I0aa1e1118857d338804f912decdc2f6d388c13ce