Huge patch:
  * Compile with Wall, Wextra, Werror
     - Remove unused variables
     - Enable large file support
     - Fix esps read/write (inside a structure there can be padding bytes that were being ignored)
Rerun autoconf
Fake use of unneded parameter
Fixes to make it compile -Wall -Wextra with clang. Honor user given CFLAGS above all.
Handle a custom compiler case (for instance the clang static analyzer).
Remove some dead assignments left.
get_c_int returns a long int. maximum integer in scheme raises from 2^32 to 2^53 :-)
Fixes: Make sure IPointer is initialized. Adds EST_Item and EST_Val ssize_t support
Add -Wno-mismatched-tags so festival with clang builds
Merge branch 'master' of github.com:zeehio/speech-tools