Added printf test for double type cases

[shajder]

according to work plan for issue #1058

[svenvh]

LGTM modulo some minor nits.

I don't have any fp64 devices for testing though, so this should ideally be reviewed by vendors supporting fp64.

[bashbaug]

LGTM, I tested a couple of devices that support fp64 and most of them passed.

I did find a couple of failures with POCL, but these appears to be POCL issues and not test issues (maybe the double literal is interpreted as a float literal?):

14)testing printf("%-#20.15e",789456123.0)
verifyOutputBuffer failed with kernel: 
__kernel void test5(void)
{
   printf("%-#20.15e\n",789456123.0);
}

 expected: 7.894561230000000e+08
 got:      7.894561280000000e+08
15)testing printf("%+#21.15E",789456123.0)
verifyOutputBuffer failed with kernel: 
__kernel void test5(void)
{
   printf("%+#21.15E\n",789456123.0);
}

 expected: +7.894561230000000E+08
 got:      +7.894561280000000E+08

[bashbaug]

Note, there is a merge conflict that needs to be resolved.

[shajder]

Note, there is a merge conflict that needs to be resolved.

Conflicts solved.