New Version v0.17.5.

.*rst: Migration back from qfq-doc to qfq

Release.rst: Request from Myriam Steinbrecher to enlarge placeholder value in FormElement. Old 512, New 2048.

Implemented the option to make a form `readonly`. this can be done statically or dynamically via variable (e.g. SIP).
QuickFormQuery.php, AbstractBuildForm.php: Force 'readonly' by overwriting FormElement individual 'mode' setting.
BuildFormBootstrap.php: Introduced new variable F_SHOW_BUTTON.

#3431 / typeAheadSql: columnname 'key' is a reserverd SQL statement - replace by 'id'. Additional the parametername 'typeAheadLdapKeyPrintf' renamed to 'typeAheadLdapIdPrintf'.
typeAhead.php: fixed typo.
TypeAhead.php: introduced new mapping from 'id' (SQL) to 'key' (API).
AbstractBuildForm.php: Constant renamed.
Database.php: update function makeArrayDict() to reflect name mapping.

HTML.md: update latest attribute names
Release.rst: copied git log

reST Documentation: new chapter 'release'. Existing chapters moved from separate directory to main directory. Chapter 'UsersManual' splittet in 'Concept', 'Form', 'Report'

BuildFormBootstrap.php, Store.php: conig.qfq.ini extended to hold new parameter, save button will be build with new attribute.

AbstractBuildForm.php:
#3224, #3231 Html Tag <hr> als FormElement. >> htmlBefore | htmlAfter, FormElement.parameter = htmlBefore|htmlAfter implemented.
#3230 templateGroup: Abstaende zwischen Elementen. 'tgClass' implemented

BuildFormPlain.php: code restructured

AbstractBuildForm.php: see title