Multiple issues with f4 to fix each one independently, discuss when needed

[Maciej Komosinski]

1. add f4 tests with invalid genotypes (to test problematic parsing, valgrind)
2. add f1 tests to see if introducing GeneProps? did not change the calculation of properties (and detect the 'm' bug!)
3. implement approximate, fast, very low and constant complexity coloring in f4 (styles) just like it is done in f1
4. oper_f4.cpp:137 maybe move all modifier definitions to one location
5. oper_f4.cpp:178 address this TODO
6. f4_general.cpp:478 address this TODO
7. "default move control to neuclasshandler" unclear meaning
8. same: "error: if no previous"
9. same: "Need to check if exists"
10. same: //they belong to neurons
11. same: "tc3 is only to ensure that in the end of neuron parameter definition"
12. check: sprintf((char*)buf2.c_str(), "%d", i1); and all other similar use cases
13. makeNull() never used?
14. char count; repetition counter - TODO discuss the CHAR type
15. f4_general.h from line 160 upwards. Fix English, merge (remove spaces) * (pointer) with variable names or type names when there is no variable name
16. unify modifier macros between f1 and f4?
17. still true? #define F4_MODIFIERS_VISUAL "" //not supported in f4
18. fix Geno_f4::style, old pieces of code remain and clash with new
19. still needed?

    	double       state;            ///<state of neuron
    	double       inertia;          ///<inertia of neuron
    	double       force;            ///<force of neuron
    	double       sigmo;            ///<sigmoid of neuron
    

20. out of line comment?

// a collection of cells, like Organism, for developmental encoding
and another
// convert f4 geno string to tree structure (internal)

21. unclear in parentheses:

    @return 0 if repair can be performed, -1 otherwise (the repair flag wasn't set in constructor)
    

22. int min, int max -> int mn, int mx
23. @param current parent of the analysed branch of the genotype - there is no "current" arg?
24. notation everywhere:

    double * v -> double *v
    const char * parse() -> const char* parse()
    

[Maciej Komosinski]

In 767:

More strict parsing of the repetition counter; bug fixes; improved docs [refs #62]

[Maciej Komosinski]

Restored the full list of (fixed earlier) issues, for documentation purposes

[Maciej Komosinski]

In 770:

Avoided "min" and "max" as variable names, fixes issue 22 [refs #62]

[Maciej Komosinski]

In 771:

Added color and size modifiers in f4; avoided unnecessary conditions in styling; fixes issue 17 and concerns issue 18 [refs #62]

[Maciej Komosinski]

In 772:

Unified #define modifiers in f1 and f4, fixes issue number 16 [refs #62]

[Maciej Komosinski]

In 773:

Improved styling implementation, fixes issue number 18 [refs #62]

[Maciej Komosinski]

In 774:

Removed unused "state" field (issue number 19), improved docs (issues number 20,21,23), code formatting (issue number 24) [closes #62]