Add man pages

Signed-off-by: Mattias Andrée <maandree@kth.se>

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+.TH LIBSIMPLE_MEMRELEM_INV 3 2018-11-24 libsimple
+.SH NAME
+libsimple_memrelem_inv \- find different aligned byte string in memory
+.SH SYNOPSIS
+.nf
+#include <libsimple.h>
+
+void *libsimple_memrelem_inv(const void *\fIhaystack\fP, size_t \fInhaystack\fP, const void *\fIneedle\fP, size_t \fInneedle\fP);
+
+#ifndef memrelem_inv
+# define memrelem_inv libsimple_memrelem_inv
+#endif
+.fi
+.PP
+Link with
+.IR \-lsimple .
+.SH DESCRIPTION
+The
+.BR libsimple_memrelem_inv ()
+function scans the memory segment
+.IR haystack ,
+with the size
+.IR nhaystack*nneedle ,
+for the last occurence of a byte string
+different from
+.I needle
+with the size
+.IR nneedle ,
+and with an offset equivalent to zero modulo
+.IR nneedle .
+.PP
+The comparison is case-sensitive.
+.SH RETURN VALUE
+The
+.BR libsimple_memrelem_inv ()
+function returns the pointer
+.I s
+with a maximal offset such that
+.IR memcmp(r,needle,nneedle) ,
+where
+.I r
+is the returned pointer, and such that
+the offset is equivalent to zero modulo
+.IR nneedle .
+If no such offset exists,
+.B NULL
+is returned.
+.SH ERRORS
+The
+.BR libsimple_memrelem_inv ()
+function cannot fail.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lb lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.BR libsimple_memrelem_inv ()
+T}	Thread safety	MT-Safe
+T{
+.BR libsimple_memrelem_inv ()
+T}	Async-signal safety	AS-Safe
+T{
+.BR libsimple_memrelem_inv ()
+T}	Async-cancel safety	AC-Safe
+.TE
+.SH EXAMPLES
+None.
+.SH APPLICATION USAGE
+None.
+.SH RATIONALE
+None.
+.SH FUTURE DIRECTIONS
+None.
+.SH NOTES
+None.
+.SH BUGS
+None.
+.SH SEE ALSO
+.BR libsimple_memrelem (3),
+.BR libsimple_memelem_inv (3),
+.BR libsimple_memrmem_inv (3),
+.BR libsimple_memrchr_inv (3)