Log Message:
Update rudiments to 0.47.

Changes:
- fixed possible null-dereference in xmldomnode::safeAppend
- added charstring::inSetIgnoringCase
- xmldomnode::setAttributeValue does nothing when the null node is
  referenced now
- fixed a codetree bug that could cause indentation to attempt to go
  negative when using an unsigned number
- added a configure test to see if -Wno-format is needed
- configure tests for mlockall/munlockall attempt link now
- added sys/types.h before sys/un.h in sys/un.h test for older freebsd
- implemented stubs for pure virtual methods of client and server classes so
  instances of them could be created to attach already-open file descriptors
- unified usage of select/poll and prefer poll
- pushed all select/poll-related code into listener class
- removed problematic and unused useListener-related methods in
  filedescriptor class
- epoll is used in place of select/poll for systems that support it
- kqueue is used in place of select/poll for systems that support it
- consolidated getpagesize() calls to use sys::getPageSize()
- added detection and support for __vsnprintf for platforms that have
  that instead of vsnprintf
- added cancel and raiseSignal methods to the thread class
- fixed datetime memory leak
- added xmldomnode::clone method to clone a node
- renamed variablebuffer to bytebuffer
- renamed rawbuffer to bytestring
- refactored linkedlist
- added singlylinkedlist class
- added sort, detach, move and insert methods to linkedlist classes
- fixed file::open using O_CREAT without O_EXCL on windows