Added strict flag to parser:

Have added a new bool strict flag to the parsing functions, if the
strict flag is set to false the parser will just skip lines with unknwon
keywords, including pure garbage in the input. I.e. for a deck like:

TABDIMS
  1 1 1 /

Crap - not a keyword at all

-- Correctly formatted - unknown keyword
IGNORED
  0 1 /

The parser will load the TABDIMS keyword correctly, and skip the rest.

testdata/integration_tests/Resinsight/DECK1.DATA

@@ -0,0 +1,22 @@
+SPECGRID
+ 20  20 10 /
+
+IGNORED
+Have no clue /
+how to /
+parse This keyword/
+/
+ 
+
+FAULTS 
+  'F1'  1  1  1  4   1  4  'X' / 
+  'F2'  5  5  1  4   1  4  'X-' /
+/
+
+And then comes more crap??!
+
+-- And a valid keyword:
+TABDIMS
+ 1 2 3 /
+
+And it ends with crap?!