a lot of bugfixes

change timestamp type to long
is_file/dir/readable/writable/executable: check for invalid path chars
and add chars caching
add pdb-only debug info mode
change configurations DeepCopy like Jakub suggested
revert memory leak fix from ScriptContext
wrong encoding in ScriptContext.RunApplication
add information about file and line in timeout error
curl: bug with password in url
soap: getLastRequestHeaders, getLastRequestHeaders and bugfixes
xml_parse_into_struct: accept xml in all types without conversions
iconv: bug when string converted from not PageEncoding
iconv/mbstring: support for encoding names in cp* format