Adding undocumented API Get_Account_Balance

.gitignore

@@ -1,3 +1,4 @@
 node_modules/*
 dist
 coverage
+.vscode

docs/1.5-Built-in-functions.md

@@ -92,6 +92,9 @@ void distributeToHoldersFx(
 );
 long getAssetHoldersCount(long minimumQuantity, long assetId);
 long getAssetCirculating(long assetId);
+long getAccountBalance(long accountId);
+fixed getAccountBalanceFx(long accountId);
+long getAccountQuantity(long accountId, long assetId);
 
 // Special instructions
 long mdv(long m1, long m2, long div);
@@ -497,6 +500,28 @@ Returns the quantity of 'assetId' currently in circulation.
   1) In treasury accounts;
   2) In sell orders;
   3) In accountId zero (burn address).
+
+### getAccountBalance, getAccountBalanceFx
+* Prototype:
+`long getAccountBalance(long accountId);`
+* Fixed version prototype:
+`fixed getAccountBalanceFx(long accountId);`
+* Description:
+Returns the SIGNA balance owned by 'accountId'.
+If there is no accountId, returns zero.
+When used to get the balances from smart contracts, it will return the balance on last block, not the one after the execution on current block.
+Same applies to get the own contract balance, which is the same as signum API Get_Previous_Balance and most of times not useful.
+* Note that some parts of the balance are also considered:
+  1) Commitment.
+
+### getAccountAssetQuantity
+* Prototype:
+`long getAccountQuantity(long accountId, long assetId);`
+* Description:
+Returns the quantity of 'assetId' owned by 'accountId'.
+When used to get the balances from smart contracts, it will return the balance on last block, not the one after the execution on current block.
+* Note that some quantities are also considered:
+  1) In sell orders.
 </details>
 <details>
 <summary>

docs/2-API-Pseudo-Code.md

@@ -657,6 +657,21 @@ long Get_Asset_Circulating(void) {
        treasury account.
     */
 }
+
+long Get_Account_Balance(void) {
+    // Assembly name: Get_Account_Balance
+    accountId = B1;
+    assetId = B2;
+
+    if(assetId == 0L){
+        balance = Blockchain.getAccountBalance(accountId);
+        // if there is no account, then return zero
+        return balance
+    }
+    quantity = Blockchain.getAccountQuatity(accountId, assetId);
+    // If there is no account, or if account does not have the given asset, returns 0
+    return quantity
+}
 ```
 </details>
 <details>
@@ -821,6 +836,21 @@ fixed F_Get_Activation_Fee(void) {
     }
     return 0;
 }
+
+fixed F_Get_Account_Balance(void) {
+    // Assembly name: Get_Account_Balance
+    accountId = B1;
+    assetId = B2;
+
+    if(assetId == 0L){
+        balance = Blockchain.getAccountBalance(accountId);
+        // if there is no account, then return zero
+        return balance
+    }
+    quantity = Blockchain.getAccountQuatity(accountId, assetId);
+    // If there is no account, or if account does not have the given asset, returns 0
+    return quantity
+}
 ```
 </details>