Convert some public constants
Julian date conversion
Disable Octal et Hexadecimal format in sscanf method

In sscanf the original code use octal or hexadecimal format when number start with '0' or '0x' with '%d' format. This is not a standard correct behavior, we use '%o' and '%x' for this.

So we disable this part by commenting, and we correcting the tests.
Correct bad formatting decimal number in printf with sign or with padded number with the good size.
Update tests
Implements swe_deltat
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Implement swe_get_planet_name() only for standard planets
Start SweMini implements