Add round(), floor() and ceiling() functions to the calculate block

Adding the following functions to the calculator

Example Usage

```calc
round(1.55)    --> 2
round(1.55,1)  --> 1.6
floor(1.55)    --> 1
ceiling(1.44)  --> 2
```

For those that need a work around, the below functions seem to work

```calc
a=1.1
ceiling=a+1-(cos((a mod 1))-(cos((a mod 1)) mod 1))-(a mod 1)
floor=a-(a mod 1)
```
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