%7F is not an escapable, printable character
disable checks assuming signedness of char
do not assume signed char
avoid unsigned char conversion problems with EOF

EOF should not be forced through a char as char may be unsigned on
some platforms, leading to conversion problems.
See http://www.arm.linux.org.uk/docs/faqs/signedchar.php for more
details.
Merge pull request #310 from satta/fixes_ppc

Further porting for Linux on PowerPC, ARM and S/390
add io functions and functionpointer types module
add file io to intset
use io module
add compressed encseq class and tools

remove old tools, old classes.

fix memory problems in sfx-mappedstr, remove non existing function
start to remove encseq from n_r_encseq - use intset