Added meta file.
Added representation of celestial object.

Class containing relevant attributes.
Added mass as field.
Added function for retrieving mass.

Also corrected return type of getId().
Started writing solar system header.
Added first version of SolarSystem class.
Added methods for setting velocity and position.
In process of adding new constructor.

New constructor can take datafile as argument and read the complete
setup of the system from this file.
Added datafile for sun-earth system.

Prototype of syntax. Might be changed.
Switched syntax for datasystem files.

Can now have header on specific syntax #HEADER#. These will be ignored,
after the header #DATA# program will start recording.
Added division into x and y velocity with getfuncs
Can now initialize with constructor using datafile
Added short main file for testing initialization.
Commented on order of advance.
Added makescript.
Added more fields and switched syntax.
New functionality: Read from file containing meta.

Now, instead of setting all parameters every time
file is to be used with a new project. Instead,
all information is defined in a metafile called
`meta.dat` and located in project root (where the
`Make.py` script is located. The metafile has a
certain syntax that has to be followed but all
information can be defined there.

Will write documentation on the compile script and
the meta file later when time.
Merge branch 'development' of github.com:jaremikb/FYS3150-Prj03 into development
Removed checking of commandline arg length.

Totally useless now that commandline arguments are
no longer used.
Added distance function.