organize headers
remove old function no longer used
remove pointless wrapper function of full_fwrite
large file support and simplifications
convert to new copy_stream.[ch] API
remove old versions of copy_stream/stringtools
Merge remote-tracking branch 'ccl/pull/566/head'

* ccl/pull/566/head:
  remove old versions of copy_stream/stringtools
  convert to new copy_stream.[ch] API
  large file support and simplifications
  remove pointless wrapper function of full_fwrite
  remove old function no longer used
  organize headers

Conflicts:
	dttools/src/copy_stream.c