### Translating Gamma from fricas to sage causes exception

hello;

I just started trying sage to test Fricas integrate, but for some results, it fails, even though Fricas actually is able to do the integration.

It fails because it can't translate ~~Fricase ~~Fricas result to ~~sage, ~~sage syntax, so it gives an exception. I record this as failed integrate, since
for any exception thrown, I assume it failed. But this is not fair for Fricas since it actually did not fail.

Here is an example

```
sage: var('t, n')
anti=integrate(log(t)^(-n - 1),t, algorithm="fricas")
```

exception trapped is

```
NotImplementedError: The translation of the FriCAS
Expression cos((n+1)*pi )*Gamma((-1)*n,(-1)*log(t)) to sage is not yet implemented.
```

Why it can't translate it, since Maxima result has a gamma in it. Is it the UpperCase Gamma that is the problem?

```
integrate(log(t)^(-n - 1),t, algorithm="maxima")
-(-log(t))^n*log(t)^(-n)*gamma(-n, -log(t))
```

No error. I am using

```
SageMath version 8.3.beta5, Release Date: 2018-06-09
```

ps. Output from Fricas itself matches what is shown above OK.

```
FriCAS Computer Algebra System
Version: FriCAS 1.3.3
Timestamp: Sun Jun 17 01:20:37 CDT 2018
(1) -> integrate(log(t)^(-n - 1),t)
(1) cos((n + 1)%pi)Gamma(- n,- log(t))
Type: Union(Expression(Integer),...)
```