KConfig* API overhaul. only cosmetics, so don't panic.

KConfigBase:

• remove separator argument from list entry reading/writing functions
• introduce {read,write}XdgListEntry()
• kill readPathListEntry(), add readPathEntry() overload instead. the default value is not optional any more, as it defines the return type. this is consistent with the readEntry() functions.
• rename clean() => markAsClean(), remove rollback()
• rename ConfigState => AccessMode, getConfigState() => accessMode()
• rename {entry,group}IsImmutable() => is{Entry,Group}Immutable()
• remove NLS alias to Localized

KConfig:

• remove setGroup() & group()
• reshuffle OpenFlag enum, introduce NoCascade for symmetry
• remove setExtraConfigFiles() alias to addConfigSources()

KConfigGroup:

• inherit KConfigBase::deleteGroup() overloads
• make convertToQVariant() private, it will probably change somehow

• KConfig & KConfigGroup: deprecate entryMap()
• remove bogus declarations: KConfigGroup::setReadDefaults(), KConfig::readEntryUntranslated()
• apidox
• reshuffle the declarations in the headers

svn path=/trunk/KDE/kdepimlibs/; revision=728852