[GNC] New CSV Import Wiki Entries

[Patrick James]

For various reasons, new users have struggled with the CSV import of transactions. I looked back at the various questions, and while there is no single magic solution, I decided to write a Guided CSV Import. The strategy is to start with known CSV data, as published on the Wiki page, a clean GnuCash file and import the data both non-multi-split and multi-split.
 
If someone is struggling with a first CSV import, this guided tour will probably answer the questions of where things are going wrong.
 
https://wiki.gnucash.org/wiki/Guided_CSV_Import
 
Additionally, there have been questions about the "Amount" versus "Amount(Negated)" import columns. To help clear up issues surrounding which one to select, and how they can be used in conjunction, I also created a new Wiki page on this issue.
 
https://wiki.gnucash.org/wiki/CSV_Import_Amount
 
Since it's on the Wiki, anyone with an account can make corrections/changes as is necessary.
 
Further comments/questions/concerns are welcomed.