Moved coverage.sh to the t/ subdirectory.
Fixed some issues identified by static code analysis.

The following issues were identified and fixed:

 * Allocator sizeof operand mismatch in dbi utils.
 * Dead increment in tools/sysdb/input.
 * Memory leak (and leaving behind invalid memory) in tools/sysdbd/configfile.
 * Out-of-bound array access in core/plugin (the original report by the clang
   analyzer was wrong but pointed to a location affected by a related
   problem).
 * Stack address stored into global variable in liboconfig.

Thanks to cppcheck and the clang analyzer!
store: Don't look up services from hierarchical hosts.

We don't have any concept of service inheritance (yet?).

Also, I'm not sure if this would ever make sense in general. This might be a
query option, though.
sysdb/scanner.l: Enabled 8bit, nodefault, and warn options.
src/Makefile: Use LTLIBRARIES for libsysdb_scanner.
frontend/query: Fixed typo.
frontend: Added flex/bison based parser skeleton.

For now, this implements a mostly empty parser and helper functions to parse
strings (rather than open files). The parser accepts the "LIST" command and
ignores SQL and C style comments.