Flush streams when not writing newline character

Flush streams when not writing newline character

Some of our routines use the carriage return without a newline
to keep writing the status e.g. on stderr.
For some operating systems this seems to lead to the output
being cached in the buffers, so this change adds an explicit
fflush() for these print stamements.

Fixed #1772.

Change-Id: I3ad9c4f0e962d8a0b2f8d2341af69f0e3d01a477