rt # 81312 SIGSEV on invocation of method.
The method should only be called on an instantiated object:
  Do not use: Proc::ProcessTable->fields
  instead use: my $p = Proc::ProcessTable; $p->fields;
  We fail gracefully on the former incorrect usage.  Test 01-instantiated_object_only_methods.t added.

rt # 82175
problem on Linux with pctcpu.  Added a #define LENGTH_PCTCPU with enough space to handle to handle 1000 cpus.  Used snprintf to print warnings instead of overflow if the pctcpu data is too large for the buffer.