Indexer improvement: Only write the words index when needed

This adds a simple boolean variable that tracks if new words have been
added. When editing a page in many cases all words have already bee

Indexer improvement: Only write the words index when needed

This adds a simple boolean variable that tracks if new words have been
added. When editing a page in many cases all words have already been
used somewhere else or just one or two words are new. Until this change
all words indexes read were always written, now only the changed ones
are written. The overhead of the new boolean variable should be low.

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Indexer improvement: replace _freadline by fgets

In PHP versions newer than 4.3.0 fgets reads a whole line regardless of
its length when no length is given. Thus the loop in _freadline isn't
needed.

Indexer improvement: replace _freadline by fgets

In PHP versions newer than 4.3.0 fgets reads a whole line regardless of
its length when no length is given. Thus the loop in _freadline isn't
needed. This increases the speed significantly as _freadline was called
very often.

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Indexer speed improvement: joined array vs. single lines

From my experience with a benchmark of the indexer it is faster to first
join the array of all index entries and then write them back togethe

Indexer speed improvement: joined array vs. single lines

From my experience with a benchmark of the indexer it is faster to first
join the array of all index entries and then write them back together
instead of writing every single entry. This might increase memory usage,
but I couldn't see a significant increase and this function is also only
used for the small index files, not for the large pagewords index.

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tokenizer was returning prematurely

Use native PHP JSON functions when available

Refactor tokenizer to avoid splitting multiple times

Measure length of multi-character Asian words

Do not assume that index files will be backward compatible

Remove unused idx_touchIndex function

added comment about new favicon core function

added missing subscribe link highlighting

improved some metadata comments

FS#2079: always show profile and subscribe links/buttons

Introduce metadata write wrapper p_save_metadata

p_purge_metadata now updates the metadata cache and the INFO array like the other metadata writing functions

Added XMLRPC dokuwiki:appendPage

initialised media options modal popup with display:none in JS

added minimal needed styles for modal windows

improved lib styles

Simpler ID trimming

Remove metadata conversion from 0a7e3bce (2006-11-26)

removed fixme comment

fixed mediamanager options + ie6 fix (FS#2074)

FS#1839: take favicon from mediadir (if it exists)

maintain the list of removed files in the repository

this is mainly for use with plugin:upgrade and thus will be
cherrypicked into the current stable branch as well.

improved include hooks

* moved footer and pageheader into main div
* removed header
* renamed pageheader to header