Consistent capilization of io_saveFile and psr-2 formatting

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translation update

move histogram() into MetadataIndex class

Revert "histogram() change args order"

This reverts commit 4d04b7bbfe9c97673b0f22586d88e161aca34f70.

idx_get_indexer() returns MetadataIndex

According to the development manual, for [Metadata index](https://www.dokuwiki.org/devel:metadata#metadata_index), indexer object supports `addMetaKeys()`, `

idx_get_indexer() returns MetadataIndex

According to the development manual, for [Metadata index](https://www.dokuwiki.org/devel:metadata#metadata_index), indexer object supports `addMetaKeys()`, `lookupKey()`, and `getpages()`. This means that `idx_get_indexer()` should return MetadataIndex object.

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simplify dispatch()

Respect fmode config setting

Fix hardcoded fmode overriding user config, which breaks with nondefault environments.

Fixed inconsistent handling of falsy values on fperm setting

The $conf['fperm'] value was checked in multiple files using different methods.
This can cause permission trouble with restricted environ

Fixed inconsistent handling of falsy values on fperm setting

The $conf['fperm'] value was checked in multiple files using different methods.
This can cause permission trouble with restricted environments, i.e. when chmod is forbidden and file permissions are non-default.
Now, all checks use implicit cast to boolean which leads to consistent behaviour.

Also, a misleading variable was renamed in context to better understand one of the checks.

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change static methods into instance methods

fix getPID()

getPID() will be called only when the page exists.

fix set Stopwords property

move backlinks() and mediause() into MediaIndex class

AbstractIndex class const INDEX_MARK_DELETED

obsolete fulltext.php and indexer.php files

define deprecated functions in deprecated.php file.
fix load.php, loading fulltext.php and indexer.php is nolonger necessary.

rename PagewordIndex to FulltextIndex

trigger error when lock/unlock index directory failed

histogram() change args order

INdexer::histogram() is only used in indexer_histogram.test.php file.

fix typo

change wordlen() to non-static method

fix first argument of dbg_deprecated()

use Indexer.php instead of PageIndex.php

dispatch indexing request to addPage() or deletePage()

refactor getPID()

getPID() : mark deleted page entry in page.idx
getPIDNoLock() : obsoleted
getPages() : exclude deleted pages

Add feature flag for deferred javascript

This adds a feature flag for the jQuery and main-js requests added in
#2786 and #2958. This adds only a single feature flag since deferring
jQuery without d

Add feature flag for deferred javascript

This adds a feature flag for the jQuery and main-js requests added in
#2786 and #2958. This adds only a single feature flag since deferring
jQuery without deferring the main javascript request is likely to cause
errors and confusion.

The feature flag defaults to "on" as this should be unproblematic except
for a few plugins. Also, with this flag being on by default, it should
see more usage and is more likely to uncover existing issues.

This feature flag should be removed once this feature is deemed safe.

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