Prevent VQEC from running out of memory

It seems there's a  bug in VQEC  that manifests itself with a fact
that it's running out of memory  surfacing VQEC_ERR_SYSCALL error.
This happens  despite the fact that the number of active tuners is
actually lower then the maximum specified in the config file.

This commit fixes that problem by using malloc/free instead of the
custom allocators normally used. VQEC  allocates all of its memory
upfront,    trying   to   prevent, bad malloc/free implementations
memory  fragmentation, spikes, performance  related   issues,  and
abstract memory allocation  for  th e case when VQEC is running in
the kernel. Sadly this mechanisms fails in our case when it really
should not.

Since in our case we're running on relatively powerfull  box, with
lots of memory, using malloc/free should not harm us.

It's worth to mention that possiblility of running VQEC in kernel
mode seems to be an unnecessary complication in the year of 2013.
Ideally we'd like  to  see this  feature  go for the sake of code
simplificaton.