Now logging the Makefile targets' runtimes

Also did some performance testing on Ubuntu i3 4GB.
Compilation tests started with no gfo-files.
Parsing/linearization tests started with all gfo-files.
Ran each test just once.

  - 18 sec: compiling Geography with Ace, Ape, Ger Spa
  - 10 sec: running the Geography regression test (parse + linearize)
  - 60 sec: parsing tests/acewiki_aceowl/sentences.txt (20k sentences)
  - 160 sec: pgf_acewiki_aceowl (compile all languages)

Compilation times for individual languages (perf_compilation):

Ace 0:02.02 real, 1.97 user, 0.04 sys
Ape 0:02.05 real, 2.00 user, 0.04 sys
Cat 0:09.07 real, 8.95 user, 0.09 sys
Dut 0:00.43 real, 0.41 user, 0.02 sys
Eng 0:02.70 real, 2.62 user, 0.07 sys
Fin 0:06.33 real, 6.19 user, 0.11 sys
Fre 0:38.04 real, 37.73 user, 0.21 sys !!!
Ger 0:02.16 real, 2.10 user, 0.06 sys
Ita 0:28.40 real, 28.11 user, 0.22 sys !!!
Spa 0:09.27 real, 9.17 user, 0.08 sys
Swe 0:09.73 real, 9.58 user, 0.12 sys
Dan 0:09.72 real, 9.61 user, 0.08 sys
Nor 0:09.75 real, 9.63 user, 0.09 sys
Lav 0:03.61 real, 3.51 user, 0.08 sys
Pol 0:02.08 real, 1.98 user, 0.09 sys
Ron 0:20.54 real, 20.24 user, 0.23 sys !!!
Rus 0:03.92 real, 3.85 user, 0.05 sys