Replace remaining use of 1<<29 with MAX_POS
This escaped PR #732's notice and limited samfp.fetch() (without
any arguments) to 2^29. Replace it with MAX_POS; there were no other
remaining instances of 1<<29 relating to chomosome coordinates.
Fixes
@@ -2222,7 +2222,7 @@ cdef class IteratorRowAllRefs(IteratorRow):
self.rowiter = IteratorRowRegion(self.samfile,
self.tid,
0,
- 1<<29)
+ MAX_POS)
# set htsfile and header of the rowiter
# to the values in this iterator to reflect multiple_iterators
self.rowiter.htsfile = self.htsfile
