Unable to record cash-in transaction

[xentac]

Describe the bug
I had someone give me money and I wanted to record it in beancount. I wasn't able to figure out how to add Cash to my wallet instead of remove it.

To Reproduce
Steps to reproduce the behavior:

1. Create a transaction, with an amount of 10, from Assets:Cash to some Expense account. The transaction will be -10 Units.
2. Create a transaction, with an amount of -10, from Assets:Cash to some Expense account. The transaction will be -10 Units.

Expected behavior
A clear and concise description of what you expected to happen.
One of those two options should let me add money to Cash. One might consider it an accounts:to, but then I'm just listing all my accounts in both accounts:from and accounts:to

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[LucaBernstein]

Hi xentac, thank you for your issue!

I checked on your report and I see the problem.

I will change the logic accordingly, as I cannot see any blockers not to do so (changes a bit the current behaviour, but should be manageable).

PR: #229