Added Serbian translation
Czech translation
Added Czech language
Added Greek translation
Added Lithuanian translation
itex: unused warning suppression.
itex: export new functions for itex to matml conversion.

These are just wrappers around itex2MML_parse and itex2MML_free_string.
TODO update.
dom: store owner_document as node member.

It used to be retrieved by walking the tree from node to document,
but it was not conforming to the DOM specification, where owner_document
must be non null as soon as the element is created.
dom: return on append_child when ref_child is null.
dom_node: check documents are the same when adding a child to a node.
svg: move element registering by id to SvgDocument.

It's specific to SVG, no need to have this at the DOM level.
I know it breaks the API. But hopefully nobody cares.
[l10n] Added Turkish translation
svg_document: remove the need for an element id hash table.
render: don't setlocale.
build: don't use void * pointer arithmetic.

It's a non portable gcc extension.
New Tajik Translation
Added Russian translation
entities: add more definitions.

\Alpha \Beta \Eta \Zeta \Iota \Kappa \Mu \Nu \Rho \Tau
[l10n] Added Italian translation.