update Installation section in README.md
fix sign-compare and format warning on i386

i386 builds where broken due to an incorrect sign-compare
and the use of a 64bit specific format string
fix -Wformat in testcode
improve top level and rfc6287_test Makefile

in rfc6287_test/Makefile,
replace 'MK_MAN=no' with 'MAN=' since MK_MAN can't be set by a user.

in Makefile,
rename TEST flag to RFC6287_TEST to avoid clashes
add rfc6287_verify() tests
fix timestamp_offset and counter_window verify

 - broken termination condition in timstamp_offset verify loop did not
   account for timstamp_offset==0. The result was that verification would
   suceed for any timestamp.

 - broken termination condition in counter_window verify loop did not
   account for counter_window==0. The result was that the verification
   would execute MAX_INT times before failing.
style changes

rfc6287_test/rfc6287_test.c:
 - rename verify testfunctions
 - warp long lines

ocra_tool/ocra_tool.c, pam_ocra/ocra.c, pam_ocra/pam_ocra.c,
common/rfc6287.c:
 - wrap long lines

common/rfc6287.h, pam_ocra/ocra.h:
 - change argument indentation
1.1: update Changelog