add a standalone colnames for spam email data

data/Spam/spam.data.names.txt

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+word_freq_make
+word_freq_address
+word_freq_all
+word_freq_3d
+word_freq_our
+word_freq_over
+word_freq_remove
+word_freq_internet
+word_freq_order
+word_freq_mail
+word_freq_receive
+word_freq_will
+word_freq_people
+word_freq_report
+word_freq_addresses
+word_freq_free
+word_freq_business
+word_freq_email
+word_freq_you
+word_freq_credit
+word_freq_your
+word_freq_font
+word_freq_000
+word_freq_money
+word_freq_hp
+word_freq_hpl
+word_freq_george
+word_freq_650
+word_freq_lab
+word_freq_labs
+word_freq_telnet
+word_freq_857
+word_freq_data
+word_freq_415
+word_freq_85
+word_freq_technology
+word_freq_1999
+word_freq_parts
+word_freq_pm
+word_freq_direct
+word_freq_cs
+word_freq_meeting
+word_freq_original
+word_freq_project
+word_freq_re
+word_freq_edu
+word_freq_table
+word_freq_conference
+char_freq_;
+char_freq_(
+char_freq_[
+char_freq_!
+char_freq_$
+char_freq_#
+capital_run_length_average
+capital_run_length_longest
+capital_run_length_total
+class