Strict C89 compliance and fixing the rounding

[mohamed]

This change includes the following:

• strict compliance with ANSI C89 standard. All POSIX functions are removed which enabled compiling this code on MS Visual Studio 11 running under Windows 7. However, MSVC generates tons of warnings related to "insecure" standard C functions (e.g., strtok, asctime, localtime, etc.). To fix this, we need to start having custom macro conditions in the code which I DO NOT want now.
• Fixing the rounding of the generated prayer times to "DOWN". This is still an open issue and we need to see what Fiqh says regarding this.

[z3bi]

You should also change this line: isha = sunset + 90.0 * ONE_MINUTE;

it should be: isha = sunset + loc->calc_method.isha * ONE_MINUTE;

and instead of the if statement checking the method id, it should be checking if the type is OFFSET

[z3bi]

Also, my comment was actually to use NEAREST, not DOWN.

[mohamed]

@ameiralzoubi Both bugs above fixed. Most likely, I won't have time to work on this until next weekend in shaa Allah. If you have time, please feel free to continue. I still can check commits and give comments if you want.