Rework transaction functions (Part 2)

Follows #41 (closed)

• Check there is enough money on the pubkey before displaying the resuming transaction chart
• #120 (closed) Display in the confirmation chart pubkey’s balance before and after the transaction.
• #118 (closed) Use same function to get pubkey’s balance.
• Use one method to retrieve sources, pubkey’s balance (there is two currently)

changed milestone to %0.6.0

marked the checklist item Check there is enough money on the pubkey before displaying the resuming transaction chart as completed

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assigned to @moul

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changed milestone to %0.7.0

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marked the checklist item #120 (closed) Display in the confirmation chart pubkey’s amount before and after the transaction. as completed

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changed milestone to %0.8.0