Add strict or pedantic mode

[pashagolub]

From ledger manual:

--strict
Accounts, tags or commodities not previously declared will cause warnings.
--pedantic
Accounts, tags or commodities not previously declared will cause errors.

I would like to set such mode in the configuration. Sometimes import fails or I mistype the account name. And it takes some time later to find the typo/error.

The proposal is:

• In strict mode warnings appears on the Doctor page.
• In pedantic mode user spots error immediately and fixes it right away.

I admit this is quite a strong limitation for most of the users, so it should be turned off by default.

If you like the idea, I may try to implement it.

[ananthakumaran]

I can make it a config. ledger has strict/pedantic, but hledger has only strict (which is the same as ledger's pedantic). Are you looking for both options or one is enough?

[pashagolub]

To have a pedantic only will be fine, I hope

[ananthakumaran]

available on master 070a145

[pashagolub]

Thanks a lot!