various bug fixes

Coverity bugs -- not clearing file descriptors or using var after free.
OW_present return value in OWCAPI

From Valery Grusdev: Hi team,
I met a bug with OW_present function in owcapi library.
the funtion always return -1 independand on parameters. I've checked
versions owfs-2.8p15 and owfs-2.9p5.
file descriptor leak

Coverity bug
owq leaked in parseobject

Coverity bug
error in simultaneous calculation

Coverity bug
Handle md5 memory allocation problem

Coverity bug -- probably not needed.
fix coverity warning

DS2760 temperature should indeed ignore lower 5 bits. Also remove some
CVS markup
Remove unused code DS2415
change swig code

use defined constants for return values
Minor issue in ow_external

Coverity bug -- make sure not reading length of null property
initialize for UT_setbit

False positive Coverity bug -- but "fix" anyways
bae cleanup and safety

Coverity wanted string copy limits. Found a missing break in a switch,
and changed the code formatting to match coding style.
DS2760 warning suppression

Coverity didn't like the voltage calculation.
popen needs pclose

Coverity bug.
popen needs pclose

Another Coverity bug
Unhandled return in elabnet

Coverity bug
Suppress Coverity warning

unchecked flush fnctl in void function
Didn't check for null pointer parsing ftp address

Coverity bug
debug code in ownet could read a null buffer

Coverity bug
Possible null pointer in owftpd file listings

Coverity bug