Updated AAVSO output file, instructions, memory usage, plate scale, plots

Features:

• Slight modification to output file regarding comparison star. If a comparison star was used, the following will show: COMP_STAR-XC=[{"ra": "205.91925353189598", "dec": "48.14073270140996", "x": "656", "y": "166"}] or COMP_STAR-XC=[{"ra": null, "dec": null, "x": "656", "y": "166"}] if no plate solution. If no comparison star was used: COMP_STAR-XC=[]
• Decrease in memory usage
• If the option to use a plate solution is 'y', the reference FITS will be uploaded to astrometry.net. If 'n', EXOTIC will go to the header and check to see if a WCS exists. If there is a WCS, it will use it and give a heads-up to the user. If not, EXOTIC will not use a plate solution at all. This is different from the previous version of EXOTIC as it use to ask for permission from the user to utilize the WCS
• Updated plots in light curve fitter
• Updated sigma clip for variable observing cadences
• Added BJD fall back-calculation
• Normalized relative flux in AAVSO filein their FITS header

Bugs:

• Pixel scale updated for those who have existing ones in their header and WCS
• Fixed flat field logic
• Fixed issues with the Windows installation instructions
• Fixed figure references in instructions.