Multiple New Features Planned

[surfrock66]

From forks, I want to implement the following features and fixes:

1. Rely on "empty" and not !isset: aegixx@81a43a5
2. Script for processing the upload of a session from a csv export in the torque app: adel-s@a1b3eb8
3. Make the minimum session size configurable: adel-s@a0e6ff8
4. Show events as map markers: adel-s@0f7113c
5. Evaluate redundant result freeing: adel-s@825c59d
6. Enable multiple user accounts: adel-s@bc5ece5

[stealer0517]

Not sure if this is the preferred way to add some feature requests, but I have two ideas that would be neat (and I'm far too dumb to figure out php).

1. Ability to zoom on the chart, or set min/maxes to display on the chart.
   My mpg shoots up to 512 when I let go of the gas which makes it pretty much unusable.
   I figured out how to make the chart taller which helps a lot.

2. Multiple charts.
   Say I want to view Engine temperature, and the RPM the difference between 30-180(f) and 800-3000 is huge.
   I'm sure this could be achieved with some copy pasting, but I'm seemingly too dumb to figure out the chart.

[surfrock66]

#6 in my list is done via this commit: 45e0747

[surfrock66]

3 is done via commit cb06712
5 is done via commit c09c64a

[surfrock66]

I've done some research for 1 above, and I've decided to not implement this change; I may come back to it but for now the logic as I'm reading through works as is. Here's some research: https://www.virendrachandak.com/techtalk/php-isset-vs-empty-vs-is_null/