Changes for page Migration Guide to Nested Pages

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1		-After having upgrade the XWiki instance to a recent version (7.4+), you should convert your existing pages to nested ones. This will permit:
2		-* (1) to keep the existing hierarchy between pages, made with the parent/child relationship, which will be lost otherwise.
3		-* (2) give you the opportunity to create pages under any old page, as you could under new pages.
4		-
5		-To perform this conversion, we have developed an application called [[Nested Pages Migrator Application>>extensions:Extension.Nested Pages Migrator Application]]. Its principle is to move all existing pages under their parent, so that the old parent/child relationship become physically represented by the Nested Pages hierarchy.
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7		-= Fix the hierarchy =
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9		-However, the current hierarchy may be messy. For example, so pages inside the space ##Proposal## could have ##Main.WebHome## as parent instead of ##Proposal.WebHome## which would be more logical. It happens when the user is invited to create pages in the space ##Proposal## directly from the main page (ex: http://design.xwiki.org/).
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11		-It's important to identify such a case before applying the migration tool, because the tool won't be able to detect this kind of unwanted hierarchies.
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13		-In the previous example, the solution was to put manually the parent of all pages of the ##Proposal## space that had ##Main.WebHome## as parent, to ##Proposal.WebHome##. The following script have been used to migrate (ex: http://design.xwiki.org/):
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15		-{{code language="velocity"}}
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17		-{{/code}}
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