[Task]: Improve available mana for allotment

[begonaalvarezd]

Task description

The total mana that you can allot has to exclude the mana of all explicit accounts, except for the one you are sending to if its yours, if I have 50Mana in my wallet, but 49 come from the stored and potential of an account, that means I can only allot to someone else 1 Mana. The logic is

• If you allot to your own, you can allot all your available mana except for all the mana of other explicit accounts
• If you allot to someone else, you can allot all your available mana except for the mana of all accounts
  Stored and potential mana of an account are soulbound to the account unless its used for allotments of its own, or go through a mana lock cooldown, which we dont support atm