merge feature/tree_add branch

rework cx_tree_add() API to allow insertion of edge nodes feature/tree_add

remove condition that is always false after recent fix feature/tree_add

fix cx_tree_search() not remembering root as a valid candidate feature/tree_add

cx_tree_add_iter() - optimize check for empty trees feature/tree_add

cx_tree_add() fix missing spec for adding duplicates feature/tree_add

complete cx_tree_add() implementations feature/tree_add

fix return type of cx_tree_node_create_func feature/tree_add

complete specification for tree_add functions feature/tree_add

merge changes from default branch feature/tree_add

change cx_tree_link() from prepending to appending children - fixes #391

fix mixed up arguments for calloc()

add prototypes for cx_tree_add() family of functions feature/tree_add

minor doc fixes

add cxIteratorRef() macro

add missing convenience functions

fix name of collection base member (to avoid base.base)

fix inconsistent use of item_size and elem_size

fix members inherited by macro or include are not documented

simplify iterator structures

fix documentation

issue #389 : add separate function for immutable arrays

add iterator over raw C arrays - closes #389

improves interface of cx_sprintf() variants

implement tree continue - fixes #376

add missing cxTreeVisitorDispose() test

add missing header dependencies

add cx_tree_visitor()

fix another superfluous semicolon...

fix superfluous semicolon

add -lm to ldflags on Solaris

fix build in case CX_SZMUL_BUILTIN is undefined

allow freeing tree nodes on exit - fixes #377

add xml test case for the tree iterator

add visit_on_exit to iterator implementation

add depth assertion to basic tree iterator test

implement basic (enter only) tree iterator

set tree iterator stack pointer to NULL on dispose to avoid accidental double-frees

capitalize cx_array_declare()

vastly simplify tree iterators and add test for creating them

make cx_array_simple_add() automatically take the address of the element

add convenience macros for cx_array_*

commit complicated stuff before simplifying it

remove unnecessary flag_removal function

improve tree iterator struct and add signature for a function that can create an iterator

first draft of a tree iterator

add cx_tree_search() - relates to #165

be honest at least in the lib version

fix missing typedef

declare cx_tree_search_func function pointer

add code documentation for tree functions

update uwproj configure template

remove check that is always true in cx_arl_remove()

rename cx_array_copy_result to just cx_array_result

add cx_array_add() + fix type of cx_array_default_reallocator

add cx_array_default_reallocator

add first basic low level tree functions

update uwproj and check toolchain dependency for coverage flags - fixes #345

fix using warning options with compilers which do not support them - fixes #363

improve program flow - relates to #353

fix unnecessary printf retry when printed string is empty

fix missing va_end() calls

add cx_sprintf() variants - fixes #353

fix assertion failure depending on possibly uninitialized memory

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