data.addTemperatures: no visible global function definition for
  ‘flush.console’
data.combine.clusters: no visible global function definition for
  ‘flush.console’
data.combine.stationNet: no visible global function definition for
  ‘flush.console’
data.combine.timeseries: no visible global function definition for
  ‘flush.console’
data.extract: no visible global function definition for ‘flush.console’
data.read.phase: no visible global function definition for ‘read.delim’
result.extract.interpolate: no visible global function definition for
  ‘rnorm’
result.extract.interpolate: no visible binding for global variable
  ‘na.pass’
result.pic.histogramm: no visible global function definition for ‘png’
result.pic.histogramm: no visible global function definition for ‘hist’
result.pic.histogramm: no visible global function definition for ‘gray’
result.pic.histogramm: no visible global function definition for ‘axis’
result.pic.histogramm: no visible global function definition for
  ‘dev.off’
result.pic.maps: no visible global function definition for ‘png’
result.pic.maps: no visible global function definition for ‘dev.off’
result.pic.scatterplot: no visible global function definition for ‘lm’
result.pic.scatterplot: no visible global function definition for ‘pf’
result.pic.scatterplot: no visible global function definition for ‘png’
result.pic.scatterplot: no visible global function definition for
  ‘axis’
result.pic.scatterplot: no visible global function definition for
  ‘lines’
result.pic.scatterplot: no visible global function definition for
  ‘abline’
result.pic.scatterplot: no visible global function definition for
  ‘legend’
result.pic.scatterplot: no visible global function definition for
  ‘dev.off’
Undefined global functions or variables:
  abline axis dev.off flush.console gray hist legend lines lm na.pass
  pf png read.delim rnorm
Consider adding
  importFrom("grDevices", "dev.off", "gray", "png")
  importFrom("graphics", "abline", "axis", "hist", "legend", "lines")
  importFrom("stats", "lm", "na.pass", "pf", "rnorm")
  importFrom("utils", "flush.console", "read.delim")
to your NAMESPACE file.