Streamline loaded libraries

[sneumann]

Hi, currently, the scripts like https://github.com/ipb-halle/biobyte/blob/master/scripts/heatmap.r
load many libraries, causing long tool startup times:

# Load libraries
library(MSnbase)
library(xcms)
library(CAMERA)
library(mixOmics)
library(ape)
library(pvclust)
library(dendextend)
library(cba)
library(phangorn)
library(gplots)

In the BioBYTE context only a subset of these is required. I guess MSnbase, xcms, CAMERA can go immediately. Unsure which of the rest are really required here.
Yours, Steffen